Gagetek PTS-100 Electronic 20-Pound Propane-Tank Scale Electronic scale designed for 20-pound propane tanks Shows how much propane remains at the press of a button 5 LED indicator lights coincide with Full, 3/4, 1/2, 1/4, and Refill Accuracy plus or minus a pound; requires 2 AA batteries Measures 14-1/2 by 14-1/2 by 3-1/4 inches