Description: This is a digital TDS meter tester to test the filter water quality purity. To check the performance of your water filter, to check for hardness (1grain=17ppm), to make sure you always drink pure water. Saves measurements for convenient reading and recording arrival. Features: [LCD Display]The water quality test has a large and easy-to-read LCD screen. Highly efficient and accurate due to its advanced microprocessor technology. [Easy To Use]Support automatic temperature compensation, and the water quality test can shift between TDS and Conductivity. [Energy-Saving]Auto-off function: turns off meter after 5 minutes of non-use to conserve batteries. [Portable]Small size but Suitable for testing drinking water, pool, aquarium, RO system, Spa, or hydroponics. [Widely Applicable]Can be used in water purifiers and filters, food(vegetable, fruit)&drink quality monitoring, pools and spas, aquarium, hydroponics. Specifications: Color: White Material: ABS Style: Casual EC:09990Ous/cm TDS:0-9990ppm Dearees Celsius: 0.1-80.0 Celsius Fahrenheut:32.0-176.0 Accuracy: 2% Battery: 3V CR2032 Button Battery (Included) Application: Water Occasion: Home, Outdoor Package Size: 15.4*3*1.4cm / 6.06*1.18*0.55inch Package Weight: 69g / 0.15lb Package List: 1 * Water Quality Test 1 * Leather Bag 1 * User Manual How to use: 1.Please unplug the electrode sleeve before use. 2.Press the switch ,place the electrode into the test solution. 3.After the numerically stable ,press the HOLD button and take it out of the solution to read. 4.After reading ,turn off the meter ,wipe clean the electrode before sleeving it.