For paragraph 19(1)(e), the accuracy with which an Inspectors' Class 1 standard of measurement is verified must be expressed as an uncertainty that does not exceed:
(a) for a standard for the measurement of length of a denomination stated in column 1 in Schedule 7--the maximum permissible uncertainty stated for the denomination in column 2 in that Schedule; or
(b) for a standard for the measurement of area of a denomination stated in column 1 in Schedule 8--the maximum permissible uncertainty stated for the denomination in column 2 in that Schedule; or
(c) for a standard for the measurement of mass of a denomination stated in column 1 in Schedule 9--the maximum permissible uncertainty stated for the denomination in column 2 in that Schedule; or
(d) for a standard for the measurement of volume of a denomination stated in column 1 in Schedule 10--the maximum permissible uncertainty stated for the denomination in column 2 in that Schedule; or
(e) for a standard for the measurement of area, mass or volume of a denomination not stated in column 1 in Schedule 8, 9 or 10--the maximum permissible uncertainty appropriate to the denomination when linear interpolation is applied to the maximum permissible uncertainty stated:
(i) for a standard for the measurement of area--in column 2 in Schedule 8 ; or
(ii) for a standard for the measurement of mass--in column 2 in Schedule 9; or
(iii) for a standard for the measurement of volume--in column 2 in Schedule 10 .