The Save A Drop Meter is a simple way to make sure your plants aren’t being overwatered. The easy-to-read LCD display calculates both single-use and accumulative watering volume, giving you the information you need to turn off your hose when the time is right. Simply attach the meter between your hose and faucet to measure the flow of water. The Save A Drop Meter is also great for measuring water added to RV tanks and other tanks that you need to fill to a precise level.