GR Metrology

How to Properly Store and Handle Test Weights

Test weights are used to perform calibrations. It is very important to maintain their accuracy, and to do so there needs to be proper handling and storage of the test weights. If their accuracy is compromised, then calibrations will be off and product will be out of spec.


Class 1-7 test weights are held to the American Society for Testing and Materials (ASTM) standards and are most used in the laboratory.

These test weights should be kept in their original packaging. This with help keep dust and residue off the weights and keep them together. Store the weights near the balance to ensure they are controlled within the same temperature during use. An ideal temperature is 68 degrees Fahrenheit ± 2

When handling the test weights, be sure to use non-magnetic and non-abrasive tweezers. When possible, wear approved gloves. You should never use your bare hands to handle the test weights. The oils from your skin can affect the accuracy.


Class F test weights are held to NIST standards and are most often used in an industrial setting to calibrate larger scales.

These test weights aren’t required to be in as specific conditions as Class 1-7 test weights due to the tolerances involved. Just store these test weights in a clean dry environment and away from major contaminants.


Keeping your test weights under these conditions will save money because failure to do so results in re-calibration and decontamination of the test weights.

If you are in need of a calibration, we would be happy to assist you.




Calibration Weights



More Posts


Calibrating Electrical Test Tools

Table of Contents Calibrating Electrical Test Tools You buy the best products to do the best work. The higher the quality the better performance, this

bottle force gauge test

Mastering Force Gauges with Mark-10

Spring is coming and for many truck scale owners, that means preparing for that busy time of year. For others, it’s just the start of warm weather. Regardless…

Send Us A Message

This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.

Your form has been submitted, one of our specialist will contact you shortly.