Features・Saves measurements for convenient reading and recordingAuto-off function: turns off meter after 5 minutes of non-use to conserve batteriesAutomatic temperature compensationShift between TDS and ConductivityCan be used in : Water purifiers and filters、 food(vegetable 、 fruit)&drink quality monitoring、 pools and spas、 aquarium、 hydroponics.Conductivity: 0 -- 9990 us/cmTDS: 0-5000ppmDegrees Celsius: 0.1！80.0a??- Fahrenheit : 32.0！176.0a?°Accuracy: 2%Size: Approx 154 x 30 x 14mmIncluded・1 x TDS Tester1 x User Manual