https://www.mccoys.com/shop/p/7146665-052303-30/grillpro-80069-propane-tank-scale-20-lb
Easily check how much propane is left in a tank with this handy tank scale. Simply hook it under the handle of any standard north American 20 lb tank and lift. The scale will indicate the fullness of a propane tank within a range based on its weight.
Weight Capacity
20