Finely Turned Stainless Steel Knob Shape M1 Standard Test Weights / Calibration WeightsTesting Guideline:For balances with a division size of 0.1g to 1mgTest Weight Material:• Calibration weights of 1g or above are in stainless steel, knob shape• Weights from 1g to 10 kg include a Polycarbonate Casempn: 11117151Accuracy: +/- 100mg