AbsolutelyNew, Inc. Water Saver Meter Measures use to save water. Displays usage in gallons or liters. The minimum working pressure and flow rate for the water saver is 14 psi and 0.5 GPM. Maximum PSI 80 Helps you conserve during lawn care, car washes, and more. Fits standard outdoor hoses, nozzles, and faucets. Auto-shut off saves battery power. Runs on one CR2032 battery (included)