Regulation 116
In the case of platform weighing machines and weighbridges which are fitted with dials—
(a)
all racks and pinions shall be made of hard metal;
(b)
the extremity of the pointer shall not be a greater distance than three sixteenths of an inch from the dial, and shall meet but not obscure the graduations;
(c)
the indicating mechanism and any cylinders or tanks containing liquid shall be protected from dust and from excessive variations of temperature;
(d)
if the instrument is of a type commonly known as a self-indicating pitbank weighing machine, the pendulous lever, suspension rod and water box shall be suitably enclosed.