Feature: 1. MAIN PURPOSE: This water quality tester has a portable design and can display hydrogen gas and temperature range for convenience and practicality 2. WIDELY USED: H2 meter can be used for water electrolysis machine, hydrogen rich pot effect test, laboratory hydrogen water measurement 3. PROBE TYPE: Water quality tester adopt high sensitivity electrode, probe insert design, removable and replaceable 4. GOOD PERFORMANCE: This portable test pen features high accuracy, IP67 waterproof rating, support backlight display and temperature compensation 5. SIMPLE OPERATION: After opening the device, the electrode of H2 meter can be put into the water to start the detection, which is convenient for operators Specification: Item Type: H2 Meter Material: ABS Power Supply Battery: 3 x LR44 button batteries, single battery 160mAh Measuring Range: H2: 0-10000ppd TEMP: 0 to 60 ℃ Accuracy: ±0.01ppm Resolution: 0.001 Waterproof Class: IP67 Applicable Industries: Home drinking water, swimming pool, aquaculture, fish tank, laboratory . Package List: 1 x Test Pen3 x Battery1 x User Manual