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Course E2 weights are supposed for use during the First verification of class F1 weights and for use with weighing instruments of accuracy class I. Class E2 weights or weight sets shall constantly be accompanied by a calibration certification.This permits quickly and simple calibration to a particular degree of accuracy. In addition, for tank scale

Equally artefacts are in contrast in vacuum As well as in air. By evaluating the two artefacts of similar nominal excess weight, the massive volume difference demonstrates the air buoyancy and as a consequence results in a extremely precise dedication of air density. The buoyancy artefacts are mainly employed for the M_one vacuum mass comparator.A: