1、MAIN PURPOSE: This water quality detector is portable design, can display hydrogen and temperature range, convenient and practical. 2、WIDE APPLICATION: Can be used for water electrolysis machine, hydrogen enrichment and pot effect test, and laboratory hydrogen water measurement. 3、PROBE TYPE: The water quality detector adopts high sensitivity electrode, probe insertion type design, detachable and replaceable. 4、GOOD PERFORMANCE: This portable test pen has high accuracy, IP67 waterproof, supports backlight display and temperature compensation. 5、EASY OPERATION: After turning on the device, put the electrode of the device in the water to start the detection, which is convenient for the operator. Item Type: Water Quality Detector Model: YY-400H Material: ABS Battery: 1.5V LR44 x 3 (not included) Uses: Drinking water testing, water electrolysis machines, hydrogen rich water cups, hydrogen rich pots, etc. effect testing and data measurement in laboratory research on hydrogen water H2: Range: 0~2400ppb; 0.00~2.400ppm Resolution: 2ppb; 0.002ppm Accuracy: ±10ppb; ±0.01ppm Temperature: Range: 0.1℃~60.0℃; 32.0℉~140.0℉ Resolution: 0.1℃; 0.1℉ Accuracy: ±0.5℃ 1 x Detector 1 x User Manual