Feature 1Electrode is used, and the contact area with water is large, and the measurement result is reliable and accurate. 2Electrode of the water quality tester is designed to be detachable, which is faster and more convenient. 3Drinking hydrogen rich water for a long time can effectively remove the free radicals in the body, which can help sleep and improve the skin. 4LCD high definition display with backlight function can easily cope with the night environment. 50~50 automatic temperature compensation automatically eliminates measurement errors according to changes in ambient temperature.Item Type: DissolveHydrogenMeterMaterial: 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: 0~50Battery Information: 2 x AAA Battery 1.5V(Battery Not Included)Working Temperature: 0~50 .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 xDissolveHydrogenMeter1 x User Manual