the only real way to know is to weight the propane tank.
our Roo has a tank selector that turns green or red, depending on supply.
i think it starts to change from green to red before it gets empty, but i'm not sure. also, you can tell by the way the burner's flame behaves, when it's getting low.
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Dan-Retired California Firefighter/EMT
Shawn-Musician/Entrepreneur/Wine Expert
and Zoe the Wonder Dog(R.I.P.)
2016 PrimeTime TracerAIR 255, pushing a 2014 Ford F150 SCREW XTR 4x4 3.5 Ecoboost w/Max Tow Package
4pt Equal-i-zer WDH and 1828lbs of payload capacity
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