Designed to check gas flow on Tig or Mig torches. Flowmeter tester scaled from 0 - 25 litres per minute in one litre graduations, used for testing the gas flow at the Mig or Tig torch. Simply place the tester over the Mig or Tig gas nozzle and the gas flow is measured from the top of the ball. Disable the HF on Tig welders or you may get a shock. Release the Mig wire tensioner to stop the wire feeding when testing.