NTEP Certification: What It Means and How to Check a Scale Before You Buy

Updated October 15, 2026

The short answer: NTEP certification means a scale's design (its model or "type") has been tested against NIST Handbook 44 by the National Type Evaluation Program and issued a Certificate of Conformance (CC). If a weight sets a price, a fee or a payment, most states require a scale model with a valid CC. Your state or local weights and measures office then inspects and seals the individual scale before it goes into trade use.

This guide explains what NTEP certification covers and how to check a scale's certificate before you buy. It also covers which accuracy class fits livestock, lab and floor weighing, and when you can skip it.

What is NTEP certification?

NTEP stands for the National Type Evaluation Program. It is run by the National Conference on Weights and Measures (NCWM). A manufacturer submits a scale design to an NTEP laboratory, and the lab tests it against the requirements in NIST Handbook 44. If the design passes, NCWM issues a Certificate of Conformance with a unique CC number, for example 22-056.

Three points matter most for buyers:

• NTEP certifies a type, not your individual scale. The certificate covers a model family, along with the capacity range, division sizes and configurations listed on it. Your own scale is checked later, on site.
• Indicators and weighing elements can have separate certificates. A floor scale base and its indicator may each carry their own CC. Both should be certified for a legal-for-trade system.
• "NTEP compliance" is not a separate certificate. It is shorthand for using a device that has a valid CC and is installed and used the way the certificate and Handbook 44 require.

NTEP certified vs. legal for trade

These terms get used as if they mean the same thing, but they are two separate steps:

• NTEP certified (also "NTEP approved"): the scale's design has a Certificate of Conformance. This happens once, at the manufacturer level.
• Legal for trade: the individual scale has been installed, inspected, tested and sealed by your state or local weights and measures authority (or a registered service agency, where your state allows it). It can then be used in commerce.

So an NTEP-certified scale is the starting point, not the finish line. Our guide to certified scales and legal-for-trade weighing walks through the inspection and sealing step.

How to check a scale's NTEP certificate

Before you buy a scale for trade use, take five minutes to confirm the certificate yourself:

1. Get the CC number. It should be on the product page, spec sheet or the scale's data plate. A seller who can't give you a CC number for a "legal for trade" scale is a red flag.
2. Look it up. Search the number in the NCWM NTEP certificate database. Check that the company and model name match what you're buying.
3. Check the status. "Active" means the device is still made for commercial use and the certificate is in force. "Inactive" means it is no longer made. Units already built or installed can still be used, sold and repaired.
4. Match the details. Confirm your capacity, division size (for example 1,000 lb x 0.2 lb), accuracy class and number of divisions fall inside what the certificate lists.
5. Check the indicator and load cells. Make sure the indicator you'll use is certified too. If the CC lists the load cells as non-NTEP, they were tested only as part of that scale and cannot be swapped for a different load cell model.

NTEP accuracy classes: which one you need

Handbook 44 sorts scales into accuracy classes. The class is set partly by "n", the number of scale divisions (capacity divided by the division size). This table summarizes Handbook 44, Section 2.20 (Tables 3 and 7a):

What that means in practice:

• Ranch and sale-barn scales that weigh cattle for payment fall under Class III L. Most livestock scales used only for herd records, dosing and growth tracking don't need to be legal for trade. Our cattle scale buyer's guide covers that choice.
• Lab and dispensary balances sold by weight usually need Class II, or Class I for very fine readings. Some states set a minimum class for certain products, so confirm with your state before you buy.
• Floor and bench scales used to sell or ship by weight are typically Class III.

When you need an NTEP scale (and when you don't)

You almost certainly need one if the weight decides money:

• Selling product priced by weight, from feed and produce to chemicals
• Buying livestock, scrap, grain or recyclables and paying by weight
• Billing freight, storage or services by weight
• Any weighing a customer relies on at the point of sale

You usually don't if the weight stays in-house:

• Herd records, weaning weights and dosing by weight
• Inventory, batching and process control
• Quality checks where no sale depends on the number
• R&D and formulation work

A legal-for-trade scale costs more, so it is worth being honest about which side you're on. Rules vary by state and by product, so check with your state weights and measures office if you're unsure.

How long does NTEP certification take?

This question comes from manufacturers getting a new design certified. According to NCWM's FAQ, testing can usually start within 1 to 4 months of the application, and the evaluation itself may take about 1 to 3 months if no problems are found. A design that fails gets 90 days to fix and resubmit.

As a buyer you don't need to wait for anything: you buy a model that already has a CC. The only wait on your side is the local inspection and sealing after installation.

NTEP scales at Liberty Scales

Here are the NTEP options we carry for the uses above. Prices are from libertyscales.com on October 15, 2026.

Browse the full ranges: LS-900 USA NTEP floor scales, Ohaus Adventurer NTEP balances and Ohaus Explorer NTEP balances. Not sure which class or capacity fits? Our analytical vs. precision balance guide helps on the lab side.

Keeping a scale legal after installation

An NTEP certificate doesn't keep a scale legal forever. To stay in trade use:

• Don't break the seal. A broken or missing security seal can take the scale out of legal service until it is re-inspected.
• Use a qualified scale technician for installation, repairs and recalibration. In many states, repairs on a sealed scale must be done by a registered service agency and reported.
• Expect periodic inspections. Many states and counties re-inspect commercial scales on a set schedule. Your state weights and measures office can tell you how often.
• Stay within rated capacity. Never weigh loads above the scale's capacity, and follow the manual's installation and leveling instructions.

Need help choosing an NTEP scale for your application? Contact our team or call (661) 888-1919 and we'll match the class, capacity and certificate to your use.

NTEP FAQ

What does NTEP stand for?

NTEP stands for the National Type Evaluation Program. It is run by the National Conference on Weights and Measures (NCWM) and tests weighing device designs against NIST Handbook 44.

Is NTEP certification required by law?

NTEP itself is a national program, but most states require a valid NTEP Certificate of Conformance for scales used in commerce. Rules vary, so check with your state weights and measures office.

How do I look up an NTEP certificate?

Search the CC number in the NCWM NTEP certificate database. Then check that the company, model, capacity range, accuracy class and status match the scale you plan to buy.

Does NTEP certification expire?

A certificate stays active while the device is still made for commercial use and its fees are paid. An inactive certificate means the model is no longer made, but units already built or installed can still be used, sold and repaired.

What accuracy class do livestock scales need?

Handbook 44 places livestock scales in Class III L when they are used for trade. Scales used only for herd records or dosing usually do not need to be legal for trade.