No worry about overfilling:It can place the receving canister on the digital scale when filling to monitor the progress of gas filling and avoid overfilling.
Built-in relief vent:If you press the relief button , it can help to reduce the internal pressure of the cartridge on the bottom side
Save money:collect residual gas to empty canister can help to save money.
It can help to transfer gas from screw type(EN417) canister to another screw type(EN417) canister.
USING TIPS: Please turn the valve to the MIN when not in using! Refill the gas in a well-ventiated area away from any source of ignition.