Section 3(6)(b) in U.P. Licences for the Possession of Undenatured Spirit, Bhang and other Excisable Articles for Medicinal and Toilet Preparation Purpose Rules, 2019
(b)All the tanks and vessels for storage of undenatured spirit shall be gauged accurately and must be fitted with proper dipping rods. Gauge chart shall be computed to show the contents of every 1 centimetre and 2 millimetre of its depth. The gauge chart shall be approved by an officer authorised by the Excise Commissioner for this purpose.