What Does Legal-For-Trade Mean?

Legal-for-Trade scales are intended for commercial use applications. They are used when a product is sold by weight. Listed below are some examples where a Legal-for-Trade scale may be needed for commercial weighing:

  • Determination of mass for commercial transactions
  • Determination of mass for the calculation of a toll, tariff, tax, bonus, penalty, remuneration, indemnity or similar type of payment
  • Determination of mass for laws or regulations; expert opinion given in court proceedings
  • Determination of mass in the practice of medicine for the purposes of monitoring, diagnosis and medical treatment
  • Determination of mass for making up medicines on prescription in a pharmacy
  • Determination of mass in analyses carried out in medical and pharmaceutical laboratories
  • Determination of price based on mass for the purposes of direct sales to the public and the making-up of pre-packages

Commercial weighing and measuring equipment is defined as, “weights and measures and weighing and measuring devices commercially used or employed in establishing the size, quantity, extent, area, or measurement of quantities, things, produce, or articles for distribution or consumption, purchased, offered, or submitted for sale, hire, or award, or in computing any basic charge or payment for services rendered on the basis of weight or measure” according to NIST Handbook 44 and 130.

The National Conference on Weights and Measures (NCWM) and the Weights and Measure division of the National Institute for Standards and Technology (NIST) formed the National Type Evaluation Program (NTEP) that certifies Legal-for-Trade weighing equipment.

NTEP is a process that tests and evaluates weighing equipment to ensure compliance with NIST Handbook 44. If you’re considering a Legal-for-Trade scale, you will need to look for NTEP approval and a valid certificate of conformance number. GRM is a premier distributor for over 25 weighing and measuring equipment manufacturers. We professionally sell, calibrate and install legal-for-trade scales and balances. Contact us for further information!



Weighing Tips


A Customized Drum Filling System


A premier producer of cemented carbide, diamond and cubic boron nitride products contacted GRM to engineer a complex drum filling system. A process was planned to have powder sifted through screens to categorize it by size into the appropriate drum. They needed a method of process control where an operator would not be required to watch each drum as it filled. An automated system was implemented to prevent overflow and error.

To free up their time and resources, we installed 3 scales under roll conveyors to maximize process flow. The scales measure the density of the powder and are programmed to send a signal to shut the system down once a threshold is met. A custom software is programmed inside the indicator to control the vibratory feeder and inform users which drums are full.

The installed software is 100% customized to their specific measurement process. This automated system saves time and resources, minimizes error and allows the operators to focus on more imperative matters.  Contact GRM to discuss how we can optimize your process!



We’re heading into peak season for rental scales! With that in mind, be sure to pre-order your scales. So, how do you know if you need to rent or purchase a scale? Below we have determined reasons you would rent.

  • Inventory counts are periodically performed
  • There’s a specialty or one-time weighing requirement
  • The primary scale is currently down
  • There aren’t enough scales to keep up with peak season
  • Weight for ERP items need to be determined

If you plan to use the scale for an on-going basis or again in the foreseeable future, it may be best to purchase the scale. However, rental scales are an inexpensive alternative if you plan to only use the scale a few times a year. You’ll save on maintenance and storage costs.

Grand Rapids Metrology offers an extensive inventory of rental equipment. This includes platform scales, checkweighers, counting scales, crane scales, laboratory balances, and more. We will deliver and setup the calibrated equipment as well as instruct your team on how to adequately operate the scale if needed!


[Guide] Visual Scope of Services

With the largest scope of capabilities in the state of Michigan, Grand Rapids Metrology is a “one-stop shop” for calibration services. This document is a visual guide to all scale and metrology equipment Grand Rapids Metrology is NIST and A2LA accredited to service. Click to view our Visual Scope of Services.

Contact our experts to more information or quickly and easily request a quote today!