How to Calibrate a Digital Scale

Posted by AWS Team on Sep 3rd 2026

A digital scale is only useful when you can trust the measurement on its display.

If your scale consistently reads too high or too low, has recently been transported, experienced a significant temperature change, or no longer reads an appropriate known reference correctly, it may need calibration.

So, how do you calibrate a digital scale?

The general process is straightforward:

Place the scale on a hard, flat and stable surface.
Allow the scale to reach a stable operating temperature.
Make sure the platform is clean and completely empty.
Confirm the batteries or power supply are functioning properly.
Turn on the scale.
Enter calibration mode according to the instructions for your exact model.
Wait until the scale displays the required calibration mass.
Place the correct calibration weight in the center of the platform.
Wait for the scale to confirm calibration.
Remove the weight and verify the result.

However, there is no universal button sequence for every digital scale.

One model may require holding the MODE button, another may use a dedicated CAL button, and another may not support user calibration at all.

The exact instructions and calibration weight required for your model should always take priority over a generic procedure.

This guide explains the complete process.

Quick Answer: How Do You Calibrate a Digital Scale?

For most user-calibrated digital scales:

Step 1: Put the scale on a stable, level surface.

Step 2: Turn it on with nothing on the platform.

Step 3: Allow the reading to stabilize at zero.

Step 4: Enter calibration mode using the model-specific instructions.

Step 5: Wait for the required weight value to appear.

Step 6: Place the exact specified calibration weight in the center.

Step 7: Wait for a confirmation such as PASS, END, or another completion message.

Step 8: Remove the calibration weight.

Step 9: Return the scale to normal weighing mode.

Step 10: Test the scale using an appropriate reference weight.

Do not substitute coins, food packages or random household objects for a proper calibration weight when accurate calibration matters.

What Does It Mean to Calibrate a Digital Scale?

Calibration establishes or adjusts the relationship between a known reference mass and the measurement produced by the scale.

A digital scale converts the force placed on its weighing platform into an electrical signal. Its internal electronics then translate that signal into the numerical value shown on the display.

During calibration, the scale uses a known reference value to establish the correct measurement response.

For example, suppose a scale's calibration procedure calls for:

500g

When the scale requests that reference, you place the appropriate 500g calibration weight on the platform.

The instrument uses that known value during its calibration routine.

Calibration is therefore very different from simply pressing the tare or zero button.

NIST maintains mass standards and calibration systems that support traceability of mass measurements throughout the U.S. measurement system. (NIST)

Calibration vs. Tare vs. Zero

These three functions are commonly confused.

Zero

Zero tells the scale that an empty platform should display:

0.00g

or the equivalent zero value for the selected unit.

Tare

Tare removes the displayed weight of a container.

For example:

Bowl = 75.00g

Press tare.

Display = 0.00g

The bowl still physically weighs 75g, but its displayed value has been subtracted.

Calibration

Calibration uses an appropriate known reference mass to establish or adjust the scale's measurement response.

Therefore:

Zero ≠ Tare ≠ Calibration

Pressing tare will not correct an incorrectly calibrated scale.

Before Calibrating: Find Your Exact Scale Model

This should be your first step.

Look at the:

Bottom of the scale
Battery compartment
Product label
Packaging
User manual
Manufacturer product page

Find the exact model number.

This matters because two scales that look almost identical may use completely different calibration procedures.

One model might require:

500g

while another 500g-capacity scale might calibrate using:

200g

The calibration weight is determined by the scale's design and instructions—not simply its maximum capacity.

There Is No Universal Digital Scale Calibration Sequence

You may find generic instructions online telling you to:

Hold MODE for five seconds and place a specific weight on the platform.

That could work for one model and be completely wrong for another.

Depending on the scale, calibration mode may be activated using:

A CAL button
MODE
UNIT
MODE + TARE
A startup button combination
A settings menu
Another manufacturer-specific sequence

Some scales are not intended to be manually calibrated by the end user.

Always use instructions written for the exact scale.

What Do You Need to Calibrate a Digital Scale?

For most user-calibrated digital scales, prepare:

Your digital scale
Its model-specific instructions
The specified calibration weight
Fresh batteries or approved power adapter
Hard and stable work surface
Clean weighing platform
Draft-free environment
Vibration-free location

For very fine precision instruments, environmental conditions become even more important.

Step 1: Put the Scale on a Hard, Flat Surface

The surface underneath the scale can affect its readings.

Good choices include a:

Solid countertop
Stable desk
Rigid table
Solid laboratory bench

Avoid:

Carpet
Towels
Beds
Sofas
Flexible mats
Uneven tables
Unstable countertops

Make sure every scale foot sits securely on the surface.

If a digital scale gives different readings before calibration, the work surface itself may be the real problem. AWS explains other common causes in its guide to Why Digital Scales Give Different Readings.

Step 2: Keep the Scale Away From Drafts

Precision scales can react to environmental conditions.

Keep the scale away from:

Fans
Open windows
HVAC vents
Air-conditioning airflow
Air purifiers

This becomes increasingly important as scale readability becomes finer.

A scale displaying to 0.001g generally requires more environmental control than an ordinary kitchen scale.

Step 3: Eliminate Vibration

Keep the scale away from operating:

Blenders
Coffee grinders
Washing machines
Speakers
Motors
Food processors
Power tools

Do not calibrate while leaning against the same table.

Even subtle vibration can make the display unstable.

Step 4: Allow the Scale to Acclimate

Avoid calibrating immediately after moving a scale between dramatically different environments.

For example:

cold vehicle → warm room

or:

hot warehouse → air-conditioned office

Allow the scale to stabilize according to its manufacturer's recommendations before performing precision calibration.

The reference weight should also be allowed to stabilize in the same environment when precision requirements justify it.

Step 5: Check the Power Supply

Weak batteries can contribute to:

Unstable measurements
Slow response
Calibration errors
Unexpected shutdown
Display problems

Before calibration:

Install fresh batteries if needed.
Use the correct battery type.
Do not mix old and new batteries.
Check the battery contacts.
Use only an approved adapter if the scale supports AC power.

If readings remain inconsistent after calibration, power should be one of the troubleshooting points you check.

Step 6: Clean the Weighing Platform

The platform should be:

clean, empty and unobstructed.

Remove:

Dust
Crumbs
Powders
Packaging
Containers
Protective covers not intended to remain during weighing

Nothing should touch the platform from the side.

Material caught around the platform may interfere with its free movement.

Follow your scale manufacturer's cleaning instructions rather than applying liquids or chemicals indiscriminately.

Step 7: Turn the Digital Scale On

Turn on the scale with the weighing platform empty.

Allow it to initialize.

The display should normally return to:

0.0g

0.00g

or:

0.000g

depending on its readability.

If the empty scale does not settle at zero, resolve that problem before attempting calibration.

Step 8: Allow the Reading to Stabilize

Do not rush directly into calibration.

Wait for the scale to provide a stable empty-platform reading.

If the reading continuously changes:

0.00g

0.02g

-0.01g

0.03g

investigate the environment first.

Possible causes include:

Air currents
Vibration
Weak batteries
Static
Temperature changes
Unstable surface
Platform interference

Repeatedly recalibrating an unstable scale will not fix a draft or vibrating table.

Step 9: Enter Calibration Mode

Now follow the exact procedure for your scale.

The display may show:

CAL

or a required weight such as:

100.00

200.00

500.00

Do not guess what weight to place on the scale.

Wait for the appropriate prompt and follow the manual.

Step 10: Use the Correct Calibration Weight

This is one of the most important steps.

Suppose your scale requests:

500g

Use the appropriate 500g calibration reference specified for that model.

Do not substitute a:

Bag of food
Phone
Jewelry item
Battery
Measuring cup
Random metal object

Professional mass calibration uses established reference standards and documented uncertainty rather than arbitrary objects. (NIST)

Does Calibration Weight Need to Equal Scale Capacity?

No.

This is a common misconception.

Suppose your digital scale has:

500g capacity

It does not necessarily require a 500g calibration weight.

Depending on the model, it could call for:

100g

200g

500g

or another specified reference.

Use what the manufacturer instructs.

Step 11: Place the Weight in the Center

When prompted, gently place the calibration weight near the center of the platform.

Do not:

Drop the weight
Slide it forcefully
Press down
Touch the platform
Exceed maximum capacity

Allow the reference mass to rest naturally on the platform.

Centered placement is generally appropriate for normal calibration unless the model instructions specify otherwise.

Step 12: Wait for Calibration to Finish

The scale may display something such as:

PASS

END

DONE

or return automatically to normal weighing mode.

Do not remove the reference weight early unless instructed.

Wait until the procedure is complete.

Step 13: Remove the Calibration Weight

Once calibration has completed, remove the reference gently.

Allow the display to return to zero.

If the scale does not return properly to zero, consult the troubleshooting section below.

Step 14: Verify the Calibration

Calibration should be followed by a basic check.

A useful repeatability procedure is:

Confirm the empty platform reads zero.
Place an appropriate check weight on the center.
Wait for the reading to stabilize.
Record the result.
Remove the weight.
Wait for zero.
Repeat several times.

AWS recommends repeat testing as part of troubleshooting inconsistent measurements, while NIST's commercial weighing guidance emphasizes accurate and repeatable measurement performance. (AWScales)

How to Calibrate a 500g × 0.01g Digital Scale

A common precision pocket-scale specification is:

500g × 0.01g

This means:

500g = maximum capacity

0.01g = readability

It does not tell you which calibration weight the model requires.

AWS explains this specification in What 500g × 0.01g Means on a Digital Scale.

To calibrate a 500g × 0.01g scale:

Identify the model.
Find its instructions.
Confirm the required calibration mass.
Prepare the correct weight.
Stabilize the scale.
Enter calibration mode.
Follow the displayed prompts.
Add the reference only when requested.
Wait for confirmation.
Verify the result afterward.

Do not automatically assume you need a 500g calibration weight merely because the maximum capacity is 500g.

How to Calibrate a 0.001g Milligram Scale

A 0.001g scale has considerably finer readability.

AWS compares this precision class with 0.01g scales in 0.001g vs. 0.01g Scales.

When calibrating a milligram scale, pay additional attention to:

Airflow
Static
Vibration
Temperature
Surface stability
Reference-weight suitability
Warm-up or stabilization requirements

Do not assume a calibration process from a 0.1g or 0.01g pocket scale applies to a milligram model.

How to Calibrate a Pocket Scale

Pocket scales are portable, which means they are also frequently:

Moved
Stored
Transported
Exposed to temperature changes

Before calibration:

Place the pocket scale on a rigid surface.
Remove its protective cover if the instructions require it.
Check the platform for debris.
Verify battery condition.
Allow the scale to stabilize.
Use the model-specific calibration sequence.

Pocket scales often provide finer readability than larger household kitchen scales, so environment and handling can have a noticeable effect.

For help choosing between scale styles, see AWS's Pocket Scale vs. Kitchen Scale Guide.

How to Calibrate a Digital Kitchen Scale

Not every kitchen scale supports manual calibration.

Some are factory-adjusted and primarily use automatic zero functions.

If your kitchen scale provides user calibration:

Read its manual.
Confirm the reference weight.
Use a stable countertop.
Keep the platform empty before starting.
Follow the exact sequence.

Do not attempt a random calibration sequence from another brand or model.

Can You Calibrate a Kitchen Scale With Flour?

No—not if you are trying to perform meaningful weight calibration.

A package labeled:

1 lb

or:

500g

is not automatically an appropriate calibration standard.

Packaging and product quantities can have production tolerances and are not replacements for the calibration reference specified for your scale.

How to Calibrate a Shipping Scale

Shipping scales generally have much higher capacities.

A shipping scale may measure:

Kilograms
Tens of kilograms
Dozens or hundreds of pounds

These devices can consequently require much heavier reference masses.

Do not attempt to calibrate a high-capacity scale using a small reference unless that procedure is explicitly specified.

For applications where charges or commercial transactions depend on weight, additional legal-for-trade requirements may apply.

NIST Handbook 44 establishes specifications, tolerances and other requirements used widely by weights-and-measures authorities for commercial weighing equipment. (NIST)

How to Calibrate a Counting Scale

Counting scales perform two related but distinct jobs:

Measuring weight
Estimating quantity from an average piece weight

Weight calibration should not be confused with sample-count programming.

First ensure the weighing system is functioning properly.

Then follow the manufacturer instructions for setting:

Sample quantity
Average piece weight
Counting mode

How to Calibrate a Bathroom Scale

Many bathroom scales do not offer conventional user weight-calibration procedures.

They may instead use automatic initialization or zeroing.

For a typical digital bathroom scale:

Place it on a hard floor.
Avoid carpet.
Initialize it according to its instructions.
Allow it to show zero.
Step onto it consistently.

If your model does not provide a calibration routine, do not attempt unrelated button combinations found online.

Can You Calibrate a Digital Scale Without a Calibration Weight?

Usually, proper external-weight calibration requires an appropriate known reference mass.

Without a suitable reference, the scale has nothing reliable against which to establish the requested measurement point.

Some advanced instruments include internal calibration systems, but this must be specifically designed into the scale.

Simply:

Resetting the scale
Pressing zero
Pressing tare
Restarting it

is not the same as calibration.

Can You Use Coins to Calibrate a Digital Scale?

Coins are sometimes suggested online as improvised calibration references.

For proper calibration, they are not the preferred approach.

Individual coins can differ due to:

Manufacturing variation
Wear
Dirt
Damage
Corrosion
Material changes among issues or years

A coin might be useful as a rough consistency check in some casual situations, but it should not replace the appropriate calibration weight specified by the manufacturer.

NIST publishes standards and guidance covering laboratory weights and reference masses used for calibration applications. (NIST)

Can You Calibrate a Digital Scale With a Nickel?

The same principle applies.

Knowing the nominal specification of a coin does not turn every individual circulating coin into a calibration standard.

When calibration accuracy matters, use the appropriate calibration mass for the scale.

How Often Should You Calibrate a Digital Scale?

There is no universal schedule suitable for every scale and application.

Calibration or a calibration check may be appropriate:

After transportation
After a significant temperature change
After long-term storage
Following an impact or overload
If an appropriate known reference reads incorrectly
At intervals required by a workplace procedure
When recommended by the manufacturer

A portable precision scale used daily may require more frequent checks than a household kitchen scale that stays on the same countertop.

For professional or commercial applications, follow the applicable quality and regulatory requirements rather than an arbitrary consumer schedule.

Should You Calibrate Your Scale Every Day?

Not necessarily.

Repeated calibration is not a substitute for troubleshooting.

Suppose your display is fluctuating because a fan is blowing across the platform.

Calibrating repeatedly will not remove the airflow.

Correct the environmental problem first.

Then assess whether calibration is actually necessary.

Should You Calibrate After Changing Batteries?

Follow the recommendations for your scale.

Replacing batteries does not automatically mean every scale must be recalibrated.

However, if the manufacturer specifies calibration after battery replacement—or an appropriate check indicates an error—follow the model instructions.

Should You Calibrate After Moving a Scale?

It can be sensible to verify a precision scale after relocation, particularly when:

It was transported over a significant distance.
The environment changed.
It experienced vibration.
Temperature changed substantially.
Measurement accuracy is important.

Perform an appropriate check before assuming calibration is necessary.

Why Won't My Scale Calibrate?

Several problems can cause calibration failure.

Wrong Calibration Weight

The scale may expect:

200g

while you are using:

500g

Confirm the exact requirement.

Weight Added Too Early

Some scales first establish the unloaded zero point.

Do not place the reference weight until prompted.

Unstable Surface

Move the scale to a rigid surface.

Vibration

Turn off nearby machinery.

Airflow

Move away from vents and fans.

Weak Batteries

Install fresh batteries.

Temperature Instability

Allow the scale and reference to acclimate.

Platform Interference

Make sure nothing touches the weighing platform.

Overload or Damage

A dropped or overloaded scale may not be correctable through normal user calibration.

What Does CAL Mean on a Digital Scale?

CAL generally indicates calibration mode.

Depending on the model, the scale may next display a required reference value such as:

100

200

or:

500

Wait for the scale's prompt.

Do not assume CAL means you should immediately place any available weight on the platform.

What Does PASS Mean?

On many scales, PASS indicates that the calibration routine has completed successfully.

Other models may display:

END
DONE
A stable weight
Normal weighing mode

Interpret the display according to the instructions for your specific model.

What Does ERR or FAIL Mean During Calibration?

An error may indicate:

Incorrect reference weight
Unstable platform
Weight added at the wrong time
Weak battery
Calibration mass outside the required range
Excessive vibration
Scale damage
Incorrect procedure

Turn off the scale, correct the likely cause and restart the procedure according to its manual.

Scale Says PASS but Still Reads Wrong

Do not immediately calibrate it ten more times.

Instead:

Confirm the calibration reference is appropriate.
Place the scale on a stable surface.
Eliminate drafts.
Eliminate vibration.
Check battery condition.
Allow temperature to stabilize.
Verify zero.
Retest the reference.

If the scale still gives an incorrect result, the problem may extend beyond routine user calibration.

Why Does My Scale Read Correctly at One Weight but Not Another?

Suppose:

100g reference → appears correct

but:

400g reference → appears noticeably incorrect

Possible explanations can include:

Scale damage
Load-cell problems
Linearity issues
Platform interference
Inappropriate reference weights
Measurement beyond the scale's useful range

Do not repeatedly adjust calibration in an attempt to compensate for a mechanical problem.

How to Check a Digital Scale After Calibration

A useful basic check is a repeatability test.

Repeatability Test

Confirm zero.
Add the same appropriate reference.
Record the reading.
Remove it.
Wait for zero.
Repeat five times.

The results should be appropriately consistent for the scale's specifications.

You can also evaluate more than one appropriate reference point when the application spans a wide weighing range.

Accuracy vs. Readability After Calibration

Calibration does not change the fundamental meaning of scale readability.

500g × 0.01g

scale has 0.01g readability.

That does not necessarily mean it is guaranteed accurate within ±0.01g across every load and operating condition. AWS specifically explains that capacity/readability specifications should not be interpreted as a guarantee that every displayed digit is exact under all circumstances. (AWScales)

Consider:

Accuracy specifications
Repeatability
Minimum usable load
Environment
Calibration
Scale condition

together.

Calibration Does Not Fix Every Scale Problem

Calibration may help when measurement response is systematically incorrect.

It cannot necessarily fix:

Physically damaged load cells
Broken platforms
Corroded electronics
Severe overload damage
Unstable flooring
Constant vibration
Strong airflow
Weak electrical connections

Troubleshoot before assuming calibration is the solution to every incorrect reading.

Choosing a Calibration Weight

When buying a calibration weight, start with the scale instructions.

Confirm:

Required mass
Required class or tolerance, if specified
Number of reference weights required
Whether multiple calibration points are used
Maximum capacity
Calibration procedure

Do not buy a calibration weight simply because its nominal mass equals your scale's maximum capacity.

Calibration Weight Care

A reference weight should be treated differently from an ordinary metal object.

Depending on the precision level, good practices can include:

Keeping it clean
Protecting it from damage
Storing it properly
Avoiding unnecessary contamination
Following any handling requirements associated with its class

Professional calibration laboratories use documented standards and procedures to maintain metrological traceability and account for measurement uncertainty. (NIST)

What Digital Scale Should You Buy If Calibration Matters?

Look for a scale with:

Clear calibration instructions
Appropriate capacity
Suitable readability
Tare
Stable display
Appropriate platform size
Manufacturer support
Available calibration reference information

Also choose the correct scale class for what you actually need to weigh.

A 0.001g scale is not automatically better than a 0.01g scale, just as a high-capacity kitchen scale is not automatically better than a precision pocket scale.

For particularly fine weighing, AWS's Best Milligram Scales Guide provides additional guidance on milligram-scale selection.

Digital Scale Calibration Checklist

Before calibration, confirm:

You know the exact scale model.
You have its correct instructions.
User calibration is supported.
You know the required calibration mass.
You have the appropriate reference weight.
The reference is suitable for your application.
The scale is on a hard surface.
The surface is level and stable.
There is no vibration.
There is no strong airflow.
Temperature is stable.
Batteries are functioning properly.
The platform is clean.
The platform is empty.
Nothing touches the platform.
The scale initializes correctly.
The empty display returns to zero.
The reading is stable.
You know the exact calibration-mode sequence.
You wait for the scale's prompt.
You place the reference in the center.
You do not exceed capacity.
You wait for calibration confirmation.
You remove the reference carefully.
You verify the result afterward.

Common Digital Scale Calibration Mistakes

Guessing the Button Sequence

Different models use different calibration procedures.

Using the Wrong Weight

A 500g-capacity scale does not necessarily require a 500g calibration reference.

Using Coins as Calibration Weights

Use an appropriate reference specified for your instrument.

Using Food Packages

A package's labeled quantity does not make it a calibration standard.

Calibrating on Carpet

Use a rigid surface.

Calibrating Beside a Fan

Remove drafts.

Calibrating While Equipment Is Vibrating

Stop nearby machinery.

Ignoring Temperature Changes

Allow the scale to stabilize when appropriate.

Using Weak Batteries

Check the power supply first.

Placing the Weight on Too Early

Wait until the scale asks for it.

Dropping the Calibration Weight

Place it gently.

Assuming PASS Means Every Scale Problem Is Fixed

Verify the measurement after calibration.

Confusing Tare With Calibration

They perform entirely different functions.

Frequently Asked Questions About Digital Scale Calibration

How do I calibrate a digital scale?

Place the scale on a stable surface, allow it to stabilize, enter calibration mode according to the exact model instructions, add the specified calibration weight when prompted, wait for confirmation and verify the measurement afterward.

What button do I press to calibrate a digital scale?

It depends on the model.

Possible controls include CAL, MODE, UNIT or a combination of buttons.

Check the instructions for your exact scale.

What weight should I use to calibrate my digital scale?

Use the exact calibration mass specified by the manufacturer or requested by the scale during its calibration procedure.

Does a 500g scale need a 500g calibration weight?

Not necessarily.

A 500g-capacity scale may use a different calibration reference.

Can I calibrate a digital scale without weights?

Proper external calibration normally requires an appropriate known reference unless the scale has a built-in internal calibration system.

Can I use coins to calibrate my scale?

Coins should not replace the proper calibration reference when accurate calibration matters.

Can I calibrate a digital scale with a nickel?

A circulating coin is not equivalent to an appropriate calibration standard.

Use the reference specified for the scale.

Can I use a bag of sugar to calibrate a kitchen scale?

A food package is not an appropriate precision calibration reference simply because a nominal weight is printed on it.

Why does my digital scale say CAL?

CAL generally indicates that the instrument has entered or is requesting calibration mode.

Follow the model-specific prompts.

Why does calibration say FAIL?

Possible causes include the wrong calibration weight, unstable surface, vibration, airflow, weak batteries, improper timing or a problem with the scale.

Why does my scale still read incorrectly after calibration?

Check the reference weight, surface, vibration, airflow, temperature, batteries and platform condition.

Persistent errors may indicate a problem that routine calibration cannot correct.

How often should I calibrate a digital scale?

Follow the manufacturer's instructions and any quality requirements for your application.

Checking may also be appropriate after transport, major environmental changes or when a suitable reference produces an unexpected reading.

Should I calibrate after moving the scale?

For a precision scale, checking performance after significant transportation is sensible.

Calibrate if the model instructions or check results indicate that it is necessary.

Is calibration the same as resetting a digital scale?

No.

Restarting or resetting the electronics is not the same as comparing and adjusting the scale against an appropriate known reference.

Is tare the same as calibration?

No.

Tare subtracts a container's displayed weight.

Calibration establishes or adjusts measurement response using an appropriate reference.

Does calibration make a scale more precise?

Calibration does not change the scale's fundamental readability.

A 0.01g scale remains a 0.01g-readability scale after calibration.

Why does my scale fluctuate during calibration?

Possible causes include airflow, vibration, static, temperature instability, weak batteries or an unstable surface.

Resolve the instability before calibrating again.

Final Verdict: How to Calibrate a Digital Scale Correctly

Learning how to calibrate a digital scale begins with one rule:

Use the procedure written for your exact scale model.

There is no universal calibration sequence or calibration weight that applies to every digital scale.

Before starting:

identify the scale → check the instructions → determine the required reference weight → stabilize the environment.

Then:

Place the scale on a hard, stable surface.
Eliminate drafts and vibration.
Allow the scale to reach stable operating conditions.
Check the batteries or power supply.
Clean and empty the platform.
Turn the scale on.
Confirm a stable zero.
Enter calibration mode.
Wait for the required calibration value.
Place the correct reference weight in the center.
Allow the calibration routine to finish.
Remove the weight.
Confirm zero.
Verify the result using an appropriate check.

Most importantly, do not confuse readability, accuracy, calibration and tare.

A scale displaying to:

0.01g

does not automatically guarantee ±0.01g accuracy under every condition.

Tare does not calibrate a scale.

And calibration cannot compensate for every mechanical or environmental problem.

Use the correct scale, the correct reference weight, stable conditions and the correct model-specific procedure. That is the foundation of accurate, repeatable digital weighing.