The Gaswatch is a digital scale that sits beneath your grill's propane tank and gives an accurate measurement of how many more burgers and beef briskets you can turn out before it's time for a refill. The device provides readouts in both percentage of gas and cook time remaining on your choice of a fixed or detachable LCD display (the latter so you can bring it inside when not in use). Calculations are based on the current weight of the propane tank.
The Gaswatch also has an alarm that sounds when propane levels drop to 20%, 15%, and 10%. With no direct connection to the tank itself, this indicator precludes any chance of a leak. No tools or additional hardware are required for Gaswatch setup.
The GasWatch digital propane gauge is a top Dude Gift for Dad pick.