1Convenient for reading data and make record, the LCD screen saves measurements for convenient reading and recording 2Auto-off function: turn off meter after 5 minutes of non-use to conserve battery 3Automatic temperature compensation 4Available to shift between TDS and Conductivity 5Ideal tools for water purifiers, swimming pool, laboratory in water plant, CDC, aquaculture farms, hospital etcDescription: The LCD digital TDS meter tester is used for testing the filter water quality purity, to check the performance of your water filter, to check for hardness (1 grain=17ppm). In order to make sure you always drink pure and safe water, the TDS meter tester is recommended for every family. Features: Convenient for reading data and make record, the LCD screen saves measurements for convenient reading and recording. Auto-off function: turn off meter after 5 minutes of non-use to conserve battery. Automatic temperature compensation function when the meter under measuring mode. Available to shift between TDS and Conductivity by clicking SHIFT button, continuously click twice of SHIFT button, shift betweenCelsius Temperature andFahrenheit. Powered by 1 pc 3V CR2032 battery, that can continuouslywork about 1000 hours. Ideal tools for water purifiers,swimming pool, laboratory inwater plant, CDC, aquaculture farms, hospital etc. Specifications: Condition: 100% Brand New Type: Portable Water Quality Tester Color: As picture Accuracy: 2% Test Item: TDS, EC, Temperature TDS: 0~9990PPm EC: 0~9990s/cm Temperature Measuring Range: 0.1~80.0 Fahrenheit:32.0~176.0 Power: CR2032 Battery (3V) X 1 (Not included) Size: Approx. 3cm x 15.5cm x 1.4cm / 1.1" x 6.1" x 0.5" Package Weight: About 60g How to use? 1. Please unplug the electrode sleeve before use 2. Press the switch; place the electrode in to 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 EC Value just for Reference Drinking Pure Water: EC=1~10 s/cm Drinking Water: EC2000s/cm Polluted Water: EC > 2000 s/cm TDS Range & Standard just for Reference 0~49 Ideal Drinking Water 50~99 Mineral Water 100~199 Hard Water 200~399 Reluctantly Acceptable Water 400~499 Bad Water 500 Polluted WaterSpecified by U.S. EPA Package Included: 1 X Water Quality Tester (without battery) 1 X User Manual 1 X Free Leather Bag Note: 1. Please allow 0~1cm error due to manual measurement. Thanks for your understanding. 2. Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object. Please take the real one as standard. 3. Keep the electrode clean, cover the electrode protective sleeve, please take out the battery for long periods idle. 4. Above "value range for reference" is just for your reference, depends on different demands the reference value may be different for people in different countries or areas. 5. Please read user manual carefully before use.