GST on supply and production meters under Schedule 3 attracts the applicable tax rate, covering supply, production and calibration. Application of GST to meters used in supply or production of gas, liquid or electricity is classified as goods under Schedule 3; supply, production and calibrating meters are taxable at the stated GST rate through 21-09-2025, bringing importation, sale and supply of these devices within the Schedule 3 goods taxonomy for that period.