This easy to use Water Flow Meter measures the water used to help you save money and prevent over watering. The meter calculates both single-use and total water consumption and displays. Usage measured in gallons or liters. Measures use to save water and money Displays usage in gallons or liters Helps you conserve water Fits 3/4 in. standard outdoor hoses, nozzles and faucets Runs on (1) CR2032 battery (included) For outdoor use and cold water only