Welcome to our store! This water quality analyzer is easy to use and provides instant visual results. It is used to measure the oxidation-reduction potential (ORP) to observe the trend of gaining or losing electrons. The transparent LCD screen with backlight allows the measurement result to be displayed directly on the screen. This product is suitable for fountains, aquariums, hydroponics, spas, swimming pools, and other water systems. The water quality tester has good performance, accurate measurement, and good stability. Item Type: Water Quality Analyzer. Material: ABS. Weight: Approx. 108g / 3.8oz. Battery Parameters: 2 x 3V (CR1632) (delivery without batteries). Test Range: 0 to plus or minus 1999mV. Resolution: 1MV. Accuracy: plus or minus 5MV. Operating Temperature: 0 degrees Celsius to 50 degrees Celsius. Usage Scenarios: suitable for fountains, aquariums, hydroponics, spas, swimming pools, and other water systems. How to use: Install the battery, open the cover, and place the measuring head in the liquid to be measured; the value can be displayed at a glance. Package Includes: 1 x Water Quality Analyzer (battery not included), 1 x Screwdriver, 1 x Manual. Satisfaction: Our customers are our top priority. If you find any product problems after receiving the goods, such as damage and incorrect quantity of goods, please contact the seller immediately. We do our best to provide you with satisfactory after-sales service.