Section 12(5)(e) in The Rajasthan Weights and Measures (Enforcement) Rules, 1959
(e)To ensure a proper check of the accuracy of weighbridge and platform machines of capacities upon five tonnes, a trader shall keep at each weighbridge one tonne and for capacities above five tones, five tonnes of standard weights or standard weights equal to one-half of the capacity of the machine, whichever is less, alongwith a set of small standard weights of such denominations as may be directed by the Controller :