Feature: 1. The water quality tester is easy to use, convenient to carry, and does not need to be adjusted frequently. 2. The water quality test pen adopts IP65 waterproof design, and the replaceable electrode tip is more convenient to operate. 3. It is a multifunctional ORP tester designed to test the oxidation‑reduction potential. 4. Suitable for water sources, aquariums, hydroponics, hot springs, swimming pools and other water systems. 5. The water quality meter has extremely high stability, high accuracy and accurate test results. Specification: Item Type: Water Quality Tester Material: Plastic Weight: Approx. 158g / 5.6oz Product Measurement Range: 0~±1999mg/LmV Resolution: 1mV Accuracy: ±5mV Working Temperature: 0~50 degrees Celsius Battery: 4 x 1.5V (AG-13) (Battery Not Included ) Waterproof Rating: IP65 Applicable Scenarios: suitable for water sources, aquariums, hydroponics, hot springs, swimming pools and other water systems. How to Use: After installing the battery, open the cover and put the measuring head into the liquid to be measured, and the value can be displayed in a moment.. Package List: 1 x Water Quality Tester (Battery Not Included )1 x Manual1 x Screwdriver1 x Protective shell