For regulation 30, the permissible variation for an Inspectors' Class 2 standard of measurement is:
(a) for the measurement of length or mass of a denomination stated in column 1 in Schedule 7 or 9--the maximum permissible variation stated in column 5 for the denomination in the relevant Schedule; and
(b) for the measurement of mass of a denomination not stated in column 1 in Schedule 9--the maximum permissible variation appropriate to the denomination when linear interpolation is applied to the maximum permissible variation stated in column 5 in that Schedule.