If it is impossible to reset to zero and exceeds the allowable error of the instrument, but the comparison value must be used, a "correction card" should be attached.
If zeroing is not possible and the instrument's tolerance error is exceeded, and a comparation value must be used, a "correction and correction card" should be attached.
If it is impossible to return to zero and exceeds the allowable error of the instrument, and the reference value must be used, the "correction card" shall be attached.