Metric, ASTM Class 4 calibration weight set for calibrating other weights, or electronic balances and scales
Stainless steel construction for stability, resistance to corrosion, and low magnetic susceptibility
Meets American Society for Testing and Materials ASTM E617, Class 4 specification for use as a reference standard for calibrating semi analytic balances, and for student use
Set of 12 weights includes one weight each of 500mg, 300mg, 200mg, 100mg, 50mg, 30mg, 20mg, 10mg, 5mg, 3mg, 2mg, and 1mg, tweezers, and a protective case