Description Function: 1.Suitable for water sources, aquariums, hydroponics, spas, swimming pools and other water systems. 2. 3 in 1 multifunction water tester, check the pH, EC and temperature of any liquid. 3.Large LCD display, easy to read the displayed value. 4.High efficiency and accuracy due to advanced microprocessor technology. 5.Lightweight and portable design, convenient for indoor and outdoor use. 6.Automatic temperature compensation (0 C ~ 60 C). 0-170 PPM water is ideal for consumption. Water 170-500 PPM is water of average quality. Water of 500 PPM and more is polluted water. 3in1 PH / EC / TEMP Product name: TDS water quality test pen Battery type: 3V button (CR2032) Test range: 0 ~ 9999ppm Product weight: 42G (net weight), 56G (total weight) Resolution: 1PPM Temperature test range: 0 ~ 99 Accuracy grade: soil 2% Working environment: 0 ~ 50 Test items: TDS value test, conductivity test, temperature test Application scope: used in water treatment industry, drinking water industry, family, personal home travel, field trip Work as a drinking water quality control tool. Influencing factors: water temperature: the TDS pen cannot be used to measure high-temperature water (for example: hot water) Water flow rate: The TDS pen cannot be used to measure water under heavy vibration Region: Each region and city has different TDS values due to different pipelines and water sources