BBQ TankMeter Grill Gauge
If you’re unsure how much propane is left in your grill’s tank, use this app to ensure you have enough to make it through the next family cookout. Simply open the app, hold your device approximately six inches from a steel propane tank, and firmly strike the center of the tank with a hard object, like metal tongs. Using the resulting acoustics, the app will indicate how much propane is left in your tank.
To buy: $2.50, play.google.com.
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