Mass certifications are available from the milligram to kilogram ranges.
In this program, groups of weights are intercompared using specified sequences that have high redundancy. Data are processed by NIST, and a certification is issued giving the mass of each weight in the customer set. Force is measured either against NIST-certified proving rings or by dead weight. Force can be measured in both compression and tension. Meet or exceed OIML Class E2 tolerances up to 60 kg.