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Individual Weight By Class
Calibration Weights and Calibration Mass Sets
Calibration Weights are used to check the reading of scale, to make sure it is still accurate. They used when calibrating a scale. While the calibration states how a scale behaves, adjustment of the scale changes its behavior. What it dose is a set of operations carried out on a scale so that it provides prescribed indications corresponding to given values of a quantity to be measured. Therefore, adjusting a scale means modifying its indications in a way that allows them to correspond – as much as possible – to the quantity values of the measurement standards applied. Calibration Weights

Find Weight By Class

ASTM Calibration Weights

  • Class 0 - Used as a primary reference for calibrating other reference standards and weights. Class 0 weights are intended to be used in metrology laboratories where the stability of the environment and careful handling are assured. Although very stable, one-piece construction Class 0 weights have no method of adjustment and are not suitable for general laboratory use. The uncertainty is guaranteed to be 1/3 the tolerance.
  • Class 1 - Can be used as a reference standard in calibrating other weights and is appropriate for calibrating high-precision analytical balances with a readability as low as 0.1 mg to 0.01 mg.
  • Class 2 - Appropriate for calibrating high-precision top loading balances with a readability as low as 0.01 g to 0.001 g.
  • Class 3 - Appropriate for calibrating high-precision top loading balances with a readability as low as 0.01 g to 0.001 g.
  • Class 4 - For calibration of semi-analytical balances and for student use..
  • Class 5 - (Class F) Primarily used to test commercial weighing devices by state and local weights and measures, device installers, and service technicians.
  • Class 6 - For rough weighing operations in physical and chemical laboratories, such as force ..
  • Class 7 - For rough weighing operations in physical and chemical laboratories, such as force ..
  • Class F - (Class 5) - Primarily used to test commercial weighing devices by state and local weights and measures, device installers, and service technicians.

OIML Calibration Weights

  • OIML Class E1 - OIML Class E1 Weights manufactured to international recommendation, OIML R111 specifications would be used to calibrate Class I/II balances, balances accurate as 0.001mg, and as a laboratory standard. These classes are considered to be of extra-fine accuracy.
  • OIML Class E2 - OIML Class E2 Weights manufactured to international recommendation, OIML R111 specifications would be used to calibrate Class I/II balances, balances accurate as 0.001mg, and as a laboratory standard. These classes are considered to be of extra-fine accuracy.
  • OIML Class F1 - OIML 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 1 kg is ±5 mg. For the calibration of high accuracy class 2 balances.
  • OIML Class F2 - OIML 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 1 kg is ±16 mg. Used as working standards for precision and analytical work, build-in weights, external weights to calibrate moderate precision balance
  • OIML Class M1 - OIML 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 1 kg is ±50 mg.
  • OIML Class M2 - OIML 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 1 kg is ±160 mg. Used for accuracy class III applications, industrial scales, dial scales, trip balances, platform scales

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