This is a pic of the meter plugged into a space heater rated at 1500 watts. The limited instructions that came with it say "Voltage, current, active power, energy".



And I just happen to be storing some plastic 15 gallon beer fermenters for an associate. Do I really need a trash bag? I presume I run the pump into a container for 15 seconds, then weigh the water, multiply by 4 and divide by 8.34 to get the GPM?