① How to choose standard weights

The selected standard weight can be a grade weight or an equal weight, but its error (mass tolerance for grade weights and verification accuracy for equal weights) must not exceed 13% of the maximum allowable error of the verified balance under that load; Secondly, the range of standard weights can cover the large weighing range of electronic scales.

② Exemption from inspection of standard weights

(1) When d ≤ 1mg, an electronic balance can be exempted from testing its discriminatory power

(2) When e ≠ d, an electronic balance is exempt from checking its discriminatory power

(3) For scales with digital indicators and automatic or semi-automatic calibration devices, the sensitivity of the balance can be exempted from inspection

③ The issuance of verification certificates should be standardized

After the calibration of standard weights is completed, a calibration certificate or calibration result notification should be issued based on the actual calibration results.