Description: This is a digital TDS meter tester for testing the purity of filter water quality. To check the performance of your water filter, to check the hardness (1 grain = 17 ppm), to ensure that you always drink pure water. Records measurements for convenient reading and recording of newcomers. Features: [LCD Display]The water quality test has a large, easy-to-read LCD display. Highly efficient and accurate thanks to its advanced microprocessor technology. [Easy to use]Supports automatic temperature compensation and water quality test can switch between TDS and conductivity . [Power saving]Auto-off function: turns off the player after 5 minutes of non-use to save batteries. [Portable]Small size but suitable for testing pH balance of drinking water, swimming pool, aquarium, RO system, spa or hydroponics. [Widely applicable] < p>Features: White Color Material: ABS Style: Casual CE: 09990Ou/cm TDS: 0-9990ppm Dearees Celsius: 0.1-80.0 Celsius Fa hrenheut: 32.0-176.0 Accuracy: 2% Battery: 3V CR2032 button cell (included) Application: water Occasion: home, outdoor Package size: 15.4*3*1.4cm/6.06*1.18*0.55in Weight package weight: 69g / 0.15lb Package list: 1*water quality test 1*leather bag< /p> 1 * User Manual How to use: 1. please unplug the electrode sleeve before use. 2.Press the switch, put the electrode into the test solution. 3.After digital stability, press the HOLD button and remove it from the solution to read. 4.After reading, turn off the reader, clean the electrode before sleeve it.