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One of the most common questions we get related to calibrating scales is "what calibration weight do I need?" There is much to unpack with this question and varies greatly depending on the user's application. Most people know how much weight is required to properly calibrate their scale, but many are unsure of what class is needed or why they matter. Calibration weights, also referred to as mass standards, are assigned a class based on their accuracy or tolerance. These tolerances are

The National Institute of Standards and Technology (NIST) updated Handbook 105-1 in 2019 with ramifications for NIST Class F weights beginning January 1st, 2020. Handbook 105-1 sets the specifications and tolerances for reference standards and field standard weights and measures. With historically few revisions, Handbook 105-1 was last revised in 1990.What's changing?The 2019 revision addresses the issues arising from the increased use of Class I and Class II weighing devices in commer