One button to switch function.Whole machine waterproof.Battary can be replaced .Portable design for easy carrying and storage.Quick and accurate test. and clear screen to view the value.Real-time display the remaining battery power.7 in 1 is the latest multifunctional water quality tester with 7 functions product, which can be used multiple times. It can measure PH/TDS/EC/ORP/specific gravity/temperature of sea water. The measurement range is and wide, and can measure water salinity and sea salt. It is suitable for digital water quality monitor , swimming pool, drinking water and aquarium.Function parameter:1. EC:Range: 0-10000us/cm, 10.01- 19.99mS/cm, 20.1400.0mS/cm (automatic range conversion) Resolution: 1uS/cm; 0.1ms/cm;Accuracy: 2%2. TDS:Range: 0-10000ppm, 10.1-20.0ppt (automatic size conversion)Resolution: 1ppm; 0.1 point Accuracy: 2%3. Salinity:Range: 0-10000ppm, 10.1-200.0ppt, 0.01%-25.00%Resolution: 1ppm; 0.1ppt; 0.01%Accuracy: 2% 0.01-5.00% (0.1%): 5.1-25.0% (1%)4. pH valueRange: 0.01-14.00HResolution: 0.01pHAccuracy: 0.054. ORP:Range: 999mvResolution: 1mvAccuracy: 2mv5. SG:1.000-1.222Product Specifications:Waterproof grade: IP67Temperature: ATC 0-60Working environment: 0-60.0C (32.0-140F);100% relative humidityTDS factor: 0.5Temperature range: 0.1-60.0 32.0-140Temperature accuracy: 0.5Temperature Resolution: 0.1C/FAutomatic shutdown: 5 minutesDisplay mode: LCD digital display backlightNote: Please clean the electrodes after useBatteries: 3 * 1.5V (LR44)Colour:white+blueMaterial:ABSPackage Contents:1 x Water Quality TesterOnly the above package content, other products are not included.Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.