Section 9 in The Standards of Weights and Measures (General) Rules, 1987
9. Working standard balances
.-(1) A set of working standard balances shall be maintained at every place where the working standard weights are kept for the purpose of verification of weights intended to be used for transaction, or protection, or industrial production.(2)The number, types and specifications of such balances shall be as are specified in Part III of the Fourth Schedule.(3)Every working standard balance shall be verified at least once in six months and shall be adjusted, if necessary, to make it correct within the limits of sensitivity and other metrological qualities as are specified in Part III of the Fourth Schedule.
