Bullet Points:1、Automatic Temperature Compensation: This Water Quality Tester Pen has an automatic temperature compensation function, which can be adjusted according to the water temperature.2、Quick Test: Is your water pure and drinkable? Using the Digital PH Tester is to test your water, it will tell you the purity level of your water in minutes. 3、Conductivity Level: Our Automatic Power-off PH Meter gives a quick indication of the electrical conductivity level of the water, which means you will know the level of test water mineralization4、Easy to Use: The Professional Water PH Tester is easy for you to record. It has a large and easy-to-read LCD screen, which makes it easier to read and record. 5、Applicable Occasions: The EC Meter Digital Water Quality Tester can be used to test drinking water, swimming pools, fish tanks, RO systems, or hydroponic water. Product DescriptionThe Digital Water Quality Test Pen can tell you the accurate results of the drinking water, hydroponic water, or water in any place. 1. Quick tester, convenient to use.2. ATC Functioned, providing precise test results.3. Widely used for drinking water and swimming pools.PropertiesName: water quality test pen Battery: button battery (included)Size: 147 * 26 * 14mm / 5.78 * 1.02 * 0.55inOperating temperature: 0 ~ 50 ° C (32 ~ 122 ° F)LCD display: 4 digitsAutomatic temperature compensation (ATC): 0 to 50°C (32 to 122°F)Packing ListWater quality test pen * 1Screwdriver * 1