Feature 1High Sensitivity Probe: Water quality tester uses high sensitivity probes with high test accuracy, and the probes are detachable,which can be replaced when broken. 2Remote Control: Digital hydrogen meter has BT function, the APP can remotely control and transmit data, and supports data transmission and printing to send to friends. 3Backlit LCD Design: The hydrogen test pen uses a backlit LCD design, so you don't have to worry about not seeing the displayed values in low light, and it can be used in the dark. 4Strong Temperature Adaptability: H2 water quality tester can adapt to the working environment temperature of 0.180.0; RH: maximum 90%, and made of ABS material, durable. 5Small Portable: The H2 meter hydrogen tester has a compact design and takes up less space. It can be carried in a bag, light and easy to use.Item Type: Water Quality TesterMaterial: ABSH2:Range: 0-2990 ppb; 0.00-2.90 ppmResolution: 1 ppb; 0.01 ppmTemp:Range: 0.1-60.0;32.1F-140.0FResolution: 0.1;0.1FAccuracy: 0.5Calibration: H2 750ppbTemperature Compensation (ATC): 0.1-60.0Working Environment: 0.1-80.0; RH: Maximum 90%Battery: 3 x 1.5V (LR44) (Delivered Without Battery)Product Size:Approx. 187 x 37 x 37mm / 7.4 x 1.5 x 1.5inBT Version: 5.2 with BacklightWeight: Approx. 157g / 5.5oz .wang-edit-text{ font-family:'Arial' !important; } .wang-edit-text table { border-top: 1px solid #000; border-left: 1px solid #000; } .wang-edit-text table td, .wang-edit-text table th { border-bottom: 1px solid #000; border-right: 1px solid #000; padding: 3px 5px; } .wang-edit-text table th { text-align: center; }Package List1 xWater Quality Tester1 x User ManualNoteShips without battery.