Scale Capacity and Readability Explained: What “2000 g x 0.05 g” Means

Every scale listing leads with two numbers, capacity and readability, and they are the fastest way to tell whether a scale fits the job. MNM Scales is one of the largest scale distributors in the country, with over 30 years in business, and this is the explanation our team gives customers every day.

Capacity: the most the scale can weigh

Capacity (often written Max) is the largest load the scale is designed to display, including the container on the pan. Choose a capacity that covers your heaviest load plus the tray, bin or box, with some headroom: running at the very top of the range leaves no margin and risks overloading the load cell. Leave extra room for shock loads on bench and floor scales. Listings give capacity in kg, lb or both; our kg to lbs converter puts two specs in the same unit before you compare.

Readability (d): the smallest step on the display

Readability, also called resolution, scale division or d, is the size of the last digit step. A 0.001 g balance changes in 1 mg steps; a 0.05 g scale changes in 0.05 g steps; a bench scale reading 0.01 lb changes in hundredths of a pound. Some scales switch readability by range: the NTEP A&D HV-15KC reads 0.002 lb up to 6 lb, 0.005 lb up to 15 lb and 0.01 lb up to 30 lb.

Divisions: capacity divided by readability

Scale	Capacity x readability	Divisions (capacity / d)
A&D GX-124AN analytical balance	120 g x 0.0001 g	1,200,000
A&D FX-120i precision balance	122 g x 0.001 g	122,000
Adam ACB-2000 portable scale	2000 g x 0.05 g	40,000
A&D EK-1200i jewelry scale	1200 g x 0.1 g	12,000
A&D FS-15Ki checkweigher	15 kg x 1 g (finest setting)	15,000
A&D HV-60KC bench scale	150 lb x 0.05 lb (top range)	3,000

More divisions means a finer reading relative to capacity, and it usually means a more sensitive, more expensive instrument that needs a steadier environment. A 0.0001 g analytical balance needs a draft shield and a sturdy table; a 0.05 lb bench scale works on a shipping dock. For the differences in detail, see analytical vs precision balances.

Readability is not accuracy

Readability tells you how finely the scale displays, not how close the reading is to the true weight. Look for these specs too:

• Repeatability: how closely repeated weighings of the same load agree (often a standard deviation). The FX-120i is rated 0.001 g.
• Linearity: the largest error across the range. The FX-120i is rated ±0.002 g, so a reading can be 2 digits off even when the display shows 0.001 g.
• Stabilization time and drift: how fast the reading settles and how much it moves with temperature.
• Calibration: a scale is only as accurate as its last calibration and the weight used (see calibration weight classes).

For the smallest amount you can weigh accurately, use the repeatability or linearity rather than readability; our pharmacy balance guide walks through the minimum accurately weighable quantity, which comes to 40 mg on a 0.001 g FX-i balance at 5% error.

d vs e on legal-for-trade scales

NTEP scales also list a verification scale division, e: the step a weights and measures official tests and the step you can charge by. Often e = d, but some balances show an extra digit. The A&D FX-120iN reads 0.001 g (d) with a certified e of 0.01 g. NIST Handbook 44 also recommends minimum loads in e: 20 e for Class III and for Class II scales with e from 0.001 g to 0.05 g, and 50 e for Class II when e is 0.1 g or more. See what NTEP means, our FX-120i vs FX-120iN comparison and the cannabis scale guide for worked examples.

How to choose capacity and readability

1. Find your heaviest load, including the container, and add headroom.
2. Find your smallest load and tolerance. As a rule of thumb, choose a readability no more than one-tenth of the tolerance you need to hold. To weigh to ±0.01 g, pick a 0.001 g balance. Counting parts or checking packs against limits? See our counting scale buying guide for minimum piece weight and our checkweigher scale guide for setting over/under limits.
3. Check the divisions. For a wide range, use two scales: a balance for small amounts and a bench scale for bulk.
4. Selling by weight? Choose an NTEP model and check the e value, not only d.
5. Compare repeatability and linearity between models with the same readability. Browse analytical balances, precision balances and bench scales.

Calibration by capacity

MNM Scales prices calibration by maximum capacity, with in-house or NIST-traceable certificates (which one do you need?). We are TDA licensed with registered technicians; nationwide mail-in calibration usually takes 1 to 3 business days, and on-site service in Houston and suburbs is a $295 service call plus $2 per mile round trip. Plan on at least yearly calibration (how often?).

Frequently asked questions

What does capacity x readability mean on a scale?

Capacity is the most the scale can weigh, and readability is the smallest step the display shows. A 2000 g x 0.05 g scale weighs up to 2000 g in 0.05 g steps.

How do I calculate the number of divisions?

Divide capacity by readability. A 2000 g x 0.05 g scale has 40,000 divisions, and a 122 g x 0.001 g balance has 122,000.

Is readability the same as accuracy?

No. Readability is the display step. Accuracy depends on repeatability, linearity, environment and calibration. For example, the A&D FX-120i reads 0.001 g with a linearity of plus or minus 0.002 g.

What is the difference between d and e?

d is the displayed scale division. e is the verification scale division on an NTEP scale, the step used for testing and for charging customers. On the A&D FX-120iN, d is 0.001 g and e is 0.01 g.

How much capacity should I buy?

Cover your heaviest load including the container, plus some headroom so you never overload the scale.

What readability do I need?

A common rule of thumb is a readability no more than one-tenth of the tolerance you need. To weigh within plus or minus 0.01 g, choose a 0.001 g balance.