1This water quality analyzer is easy to use and provides instant visual results. 2It is used to measure the oxidationreduction potential (ORP) to observe the trend of gaining or losing electrons. 3Transparent LCD with backlight, the measurement result can be displayed on the screen directly. 4Suitable for fountains, aquariums, hydroponics, spas, swimming pools and other water systems. 5The water quality tester has good performance, precise measurement and good stability. Item Type: Water Quality Analyzer Material: ABS Weight: Approx. 108g / 3.8oz Battery Parameters: 2 x 3V (CR1632) ( without batteries) Test Range: 0~1999mV Resolution: 1MV Accuracy: +-5MV Operating Temperature: 0-50 Usage scenarios: suitable for fountains, aquariums, hydroponics, spas, swimming pools and other water systems. How to Use: Install the battery, open the cover and put the measuring head into the liquid to be measured, the value can be displayed in a moment. 1 x Water Quality Analyzer (Battery Not Included) 1 x Screwdriver 1 x Manual