Feature: 1. High Sensitivity Probe: Water quality tester uses high sensitivity probes with high test accuracy, and the probes are detachable,which can be replaced when broken. 2. Remote 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. 3. Backlit 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. 4. Strong Temperature Adaptability: H2 water quality tester can adapt to the working environment temperature of 0.1℃‑80.0℃; RH: maximum 90%, and made of ABS material, durable. 5. Small 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. Specification: Item Type: Water Quality Tester Material: ABS H2: Range: 0-2990 ppb; 0.00-2.90 ppm Resolution: 1 ppb; 0.01 ppm Temp: Range: 0.1℃-60.0℃;32.1°F-140.0°F Resolution: 0.1℃;0.1°F Accuracy: ±0.5℃ Calibration: H2 750ppb Temperature Compensation (ATC): 0.1℃-60.0℃ Working 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 1.5in BT Version: 5.2 with Backlight Weight: Approx. 157g / 5.5oz. Package List: 1 x Water Quality Tester1 x User Manual Note: Ships without battery.