The Dometic Gas Level Checker GC 100 pen is a Gas Level indicator for identifying the fill level of all standard propane and butane gas bottles, letting you know how full or empty your gas bottle is.
The pocket-sized Dometic GasChecker GC 100 allows you to check LPG levels when you think of it, at your own convenience. So there's no excuse to run out of gas ever again!
This Dometic Gas Level Checker GC100 Pen works by placing it on various points on the surface of the bottle horizontally. If there is gas in the bottle at the point where the measurement is taken, then the Gas Checker GC100 signal lamp lights up in green. At the points where there is no gas, it changes to red.