Regulation 76

In testing beam scales and balances, the inspector shall satisfy himself that, when the pans are loaded to half the capacity of the instrument and the knife-edges or bearings are moved laterally or backwards and forwards within their limits of movement, there is no appreciable difference in the indications of weight shown by the instrument.

Beam scales and balances shall fall within the prescribed limits of error whether the load is on the middle or near the edges of the pans.