Features： 1、High Accuracy: Smart water quality test pen adopts a high accuracy measuring probe with high measurement accuracy. It only needs to insert the probe into the solution to quickly detect. 2、Automatic Data Storage: The data of the water test pen can be automatically saved and manually saved, the saved data can be exported to an Excel table, and can also be shared with your friends. 3、Value Setting: EC/humidity maximum or minimum limit can be set according to user requirements, if the test result exceeds the setting range, the value will be displayed in red. 4、IP67 Waterproof: The water quality test pen with backlight has good water resistance, the waterproof rating is IP67, and it is durable. 5、Wide Application: 4 In1 water quality tester can be used for household water, fish tank, swimming pool, laboratory, farmland irrigation, sewage treatment, etc. Specification： Item Type: 4 In1 Water Quality Tester Material: ABS Product Size:Approx. 15.6 x 3cm / 6.1 x 1.2in Scope: Total Dissolved Solids:0-9990ppm EC:0-9990μS/cm; 10.01-19.99ms/cm Humidity: 1-99% RH Temperature: 0.0-60.0 DegreeC, 32.0-140.0 DegreeF Resolution: Total Dissolved Solids: 1ppm EC 1μS/cm; 0.01mS/cm Humidity: 1% RH Temperature: 0.1 DegreeC 0.1 DegreeF Accuracy: Total Dissolved Solids/EC +/-2% F.S. Humidity: ≤2% RH/year Temperature:+/-0.5℃ Calibration: Total Dissolved Solids/EC 1413μS/cm (calibration Records Can Be Viewed) ATC 0.0-60.0 DegreeC; 32.0-140.0 DegreeF Environment: 0.1℃-80.0℃ Rh: Maximum 90% Waterproof: IP67 Battery: 3 x 1.5V LR44 Battery (Delivered Without Battery) Backlight: with Backlight, Support Mobile Control BT: BT Version 5.2 Printing: Support Printing Data: Save As Excel Sheet Weight: Approx. 117g / 4.1oz Package List： 1 x 4 In1 Water Quality Tester 1 x User Manual