World's First Propane Gauge for Camp Grills, Lanterns and Heaters. Now you can test disposable propane tanks before your next campout, picnic or tailgater. Simply install the app, tap the tank and Camp Grill Propane Gauge calculates how much propane is inside then graphically displays the result. Camp Grill Propane Gauge works with standard, disposable 1 pound (16.