RR,
You have to "activate" it each time you want to check the level of your keg. This is done with the strip on the keg. How it works is the hot water resets the strip and allows a reading but in a few minute the entire strip is cold again and the red goes all the way to the top again.
Semper Fi,
The Gunns
"Beer is proof that god loves us and wants us to be happy" - Benjamin Franklin
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