Multifunction: 5 in 1 multi-functional water quality tester can measure PH, TDS, EC, salinity and temperature High performance: The water quality tester water is high performance, pen-shaped design, fast digital stability, accurate calculation results Waterproof: The salinity tester has IP67 waterproof grade, can still be used when dropped in aquarium, more convenient to use Convenient operation: TDS tester probe can be replaced, automatically calibrated, high precision, high reliability and easy operation Portable: tester backlight EC, 5 minutes automatic shutdown function, light weight, small size, easy to carry Specification: Condition: 100% brand new Item type: water quality tester Material: plastic CE test range: 0 to 10,000 uS / cm 10.01 to 19.99 ms 20.1 to 400 mS / CM Resolution: 1 uS / cm; 0.1 mS / CM Accuracy: ± 2% of reading TDS test range: 0 to 1000 ppm 1000 ppm to 10,000 ppm 10.1 to 200.0 ppm Resolution: 1 ppm; 0.1ppt Precision: ± 2% of reading Salinity test range: 0.00 to 25.00% Resolution: 0.01% Precision: 0.01-5.00% (± 0.1%) 5.10-25.00% (± 1%) pH test range: 0.01-14.00 pH Resolution: 0.01 pH Accuracy: ± 0.05 pH Temperature compensation: Automatic temperature compensation (ATC) Working environment: 0 to 60.0 ℃ (32.0-140 ℉); HR 100% TDS factor: 0.4 to 1.0 Temperature range: 0.1-60.0 32.0-140 ℉ Temperature accuracy: ± 0.5 Temperature resolution: 0.1 / ℉ Auto power off: 5 minutes Display: backlight support Power consumption: 2.9 mA, the power consumption for shutdown is 0 Characteristic: At less than 150 ppt the accuracy is relatively precise, while above 160 ppt the deviation is relatively large Pile: 3 LR44 button batteries (not included) Display screen size: approx. 33 x 24mm / 1.3 x 0.9inch Product Size: Approx. 183 x 37 x 37mm / 7.2 x 1.5 x 1.5 inch Weight: approx. 162g / 5.7oz Package List: 1 x Water Quality Tester (Battery Not Included) 1 x User Manual Note : it does not include other things, the color is based on the first picture, and other pictures only show the effect Due to the differences between different monitors, the picture may not not reflect the actual color of the item. Due to manual measurement. Please allow deviation. Thank you!