Sch 6 para 11 Maximum permissible error
(1) A measuring system which falls within an accuracy class of 0.3, 0.5 or 1.0 must, when used to measure a quantity set out in column 1 of the following Table, operate within the maximum permissible error as set out in column 2, 3 or 4 of that Table for that class and that quantity. (2) In the Table, “ MMQ ” means minimum measured quantity.