Feature: 1. Wide Application: Water quality tester is widely used in environmental protection, food, health, geological exploration, metallurgy, industrial wastewater, drinking water and other testing. 2. LED Digital Screen Display: Water quality detection pen adopts LED digital screen display, which makes reading data more clear and convenient. 3. Data Saving Function: Water quality tester has a data saving device, easy to store and use, easy to operate. 4. Lightweight and Portable: The water quality detection pen is handheld, small in size and light in weight, making it easy to carry. 5. Caution: The tester under the low voltage prompt indicates that the battery voltage is insufficient. Please replace the battery as soon as possible. Do not mix old and new batteries. Specification: Item Type: Water Quality Tester Material: ABS Weight: Approx. 245g/8.6oz Display: H2 and Temperature Dual Display Measuring Range: 0-2400ppb/0-2.40ppm Resolution: 2ppb/0.2 ppm Automatic Temperature Compensation: 0~50 (℃) Operating Temperature: 0~50℃（32~122℉) Temperature Display Resolution: 0.1℃ Temperature Accuracy: ±0.2℃ Auto Shutdown: 10 Minutes Low Pressure Display: Yes ℃/℉ Temperature Conversion: Yes Data Retention: Yes Backlight Function: Without Battery: 4 x LR44 Button Cell 1.5V (Shipped Without Battery) Uses: Widely Used in Environmental Protection, Food, Health, Geological Exploration, Metallurgy, Industrial Wastewater, Drinking Water and Other Testing. . Package List: 1 x Water Quality Tester1 x Manual 1 x Storage Box Note: 1. This instrument is replaceable electrode structure, so in normal use, please do not unscrew the electrode fixing ring, so as not to enter the water caused by instrument failure.2. The life of the electrode sensor may vary depending on the frequency of use, so the electrode should be replaced when the test is not allowed.3. this instrument is used to determine the size of hydrogen content dissolved in water generated by the hydrogen rich water generator, do not use it on acidic and alkaline ionized water, ice water above 50℃, below 0℃, tea, coffee and other liquids.4. The product does not come with backlight function.