Regulation 119
In testing platform weighing machines and weighbridges, the inspector shall where practicable—
(a)
test the instrument at each numbered graduation up to and includin 1 ton, or such smaller amount as the last graduation on the steelyard indicator or dial may show; and
(b)
test all loose counterpoises, if any, relating to the instrument; and
(c)
either test the instrument ton by ton, or load it with heavy material to within 1 ton of its capacity and ascertain that an additional ton is correctly indicated to within the prescribed limits of error.