Feature:1. Electrode is used, and the area with water is large, and the measurement result is and accurate.2. Electrode of the water quality tester is designed to be detachable, which is and more convenient.3. Drinking hydrogen rich water for a long time can effectively remove the radicals in the body, which can help sleep and improve the skin.4. LCD high definition display with backlight function can easily cope with the night environment.5. 0~50? automatic temperature compensation automatically eliminates measurement errors according to changes in ambient temperature.How to Use:1. Remove the protective hat, the electrode with distilled water or water, and then wipe off the water on the electrode and the plastic parts around the electrode with filter paper (do not touch the electrode with your hands).2. Start the meter, immerse the electrode in the solution to be measured, and start the measurement.Please read the manual for detailsSpecification:Item Type: Dissolve Hydrogen MeterMaterial: ABSSize: Approx. 20.7 x 3.6 x 3.2cm / 8.2 x 1.4 x 1.3inWeight: Approx. 156g / 5.5ozRange: ppb: 0-1999ppb / ppm: 0-1.99ppmResolution: ppb: 1ppb / ppm: 0.01ppmAccuracy: ppb: ±10ppb / ppm: ±0.02ppmAutomatic Temperature Compensation: 0?~50?Battery Information: 2 x AAA Battery 1.5V(Battery Not Included)Working Temperature: 0?~50?Package List:1 x Dissolve Hydrogen Meter1 x User Manual