Usage Tips:[SPEED & ACCURACY] Integrated with the est sensor and probe, let you get data in seconds. Just in about 1 inch of water instantly you get the reading. Also upgraded with big backlit LCD make reading easier! [EASY TO USE] Our TDS meter is an easy-to-use a hand-held digital meter to instantly check your overall water quality. It allows you to stay on top of your drinking water quality at all times! A compact design with a case bonus can let you take it anywhere you need [MULTIPURPOSE & MUST-HAVE FOR ] Worry about water quality? The TDS meter is a great water quality test tool for drinking water, water filtration and purification systems such as RO systems or DI systems, aquariums, hydroponics (test nutrients), pools and spas, commercial and industrial applications, and more [INTEGRATED 3 TEST, TDS EC & TEMP] Three different measurement needs can be fulfilled by one water tester meter. Not only be convenient , but also saves your time and money, absolutely a helpful water test kit for your water safety . [NOTE: EPA suggests that the TDS of drinking water should be below 500 ppm] [AUTO-OFF AND HOLD FUNCTION] The TDS tester shuts off automatically after 2 minutes of non-use to conserve batteries. Features a hold function that saves measurements for convenient reading and recording Colour:White Material:plastic Package Contents: 1 * Water Quality Tester Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.