New gas level monitoring device

[TwentyOneThirtyFive]

Thanks for the excellent explanation WelshGas.

 

[Tactical]

Propane and Butane are liquid at low temperature.
Air/Oxygen/Helium do not liquify until very, very low temperatures.

And at what temperature does WelshGas liquify?

 

[WelshGas]

About -10c