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Extensive use in many places, such as swimming pools,drinking water, aquariums; Very good for water filters, food and drink quality monitoring AUTOMATIC TEMPERATURE COMPENSATION ( ATC ) : Digital TDS tester has the function of ATC, the testing data won’t be influenced by the water temperature, no matter testing ppm or ?s/cm. AUTO-OFF FUNCTION: Digital ppm / tds tester has the function of auto-off to save the battery’s life. SMALL SIZE and POCKET PORTABLE. TDS pen tester has small size and low weight as pen, it is easy to be carried, and convenient for you to take it in your pocket when you go out. It has measurement range 0-9999ppm, 0-9999µs/cm and ±2% accuracy. PPM meter can also tests the liquid temperature in Fahrenheit or degree Celsius.TDS EC Temperature Meter Specifications: Conductivity: 0 to 9990 µs/cm TDS: 0 to 9999 ppm (parts per million) Degrees Celsius: 0.1 to 80.0 degree Fahrenheit: 32.0 to 176.0 Fahrenheit Accuracy: +/-2% Size:154mm*30mm*14mm 4 Display modes: press SHIFT button: TDS - ppm & °C, EC - µs/cm & °C, TDS - ppm & °F, EC - µs/cm & °F. Hold function: it will lock the measure result when you press the Hold button.Then it would much easier for you to read the result Tips:TDS = Total Dissolved Solids, which is any salt, metal or mineral in the water.