19.—(1) Where an inspector has reasonable cause to believe that any working standard capacity measure or testing equipment referred to in these Regulations is not accurate within the relevant limits of error, he shall test it before use.
(2) Where testing reveals an error which exceeds the relevant limit shown in Schedule 1, 2 or 3 to these Regulations, the measure or testing equipment shall not be further used until it has been so adjusted that any error is within that limit.