Cech Corporation carries a large variety of test weights that are made in strict conformance with National Institute of Standard and Technology (NIST) Class F tolerances and specifications listed in NIST handbook 105-1. These specifications and tolerances are intended to set forth minimum requirements for calibration weights used:
(1) in the field by state and local weights and measures officials in the examination of weighing devices used in commerce;
(2) by device installers and servicemen;
(3) as reference standards in state weights and measures laboratories; &
(4) in industrial, educational, and research laboratories.