INT - Calibration Weight Classes

Class E1 These weights are the highest accuracy class, and are intended to be used for traceability between national mass standards and OIML class E2 weights and lower. The maximum permissible error from nominal value at 1kg is ±0.5mg. Used as primary laboratory reference standard.

Class E2 Suitable for use for traceability of OIML class F1 weights and lower; also with OIML accuracy class I weighing instruments. The maximum permissible error from nominal value at 1 kg is ±1.6mg. Used as a high precision standard for calibration of weights and special precision analytical instruments.

Class F1 Suitable for use for traceability of OIML class F2 weights and lower; also with OIML accuracy class I weighing instruments. The maximum permissible error from nominal value at 1kg is ±5mg. For the calibration of high accuracy class 2 balances.

Class F2 Suitable for use for traceability of OIML class M1 weights and lower; also with OIML accuracy class II weighing instruments. Intended for use in high value commercial transactions such as gold and precious stones. The maximum permissible error from nominal value at 1kg is ±16mg. Used as working standards for precision and analytical work, build-in weights, external weights to calibrate moderate precision balances.

Class M1 Suitable for use for traceability of OIML class M2 weights and lower; also with OIML accuracy class II weighing instruments. The maximum permissible error from nominal value at 1kg is ±50mg.

Class M2 Suitable for use for traceability of OIML class M3 weights; also with OIML accuracy class III weighing instruments. Intended for use in normal commercial transactions where goods are sold by weight. The maximum permissible error from nominal value at 1kg is ±160mg. Used for accuracy class III applications, industrial scales, dial scales, trip balances, platform scales

Class M3 Suitable for use with OIML accuracy class III or IIII weighing instruments. The maximum permissible error from nominal value at 1kg is ±500mg. May be used for accuracy class III L and IV.