This 4-in-1 digital water tester measures pH, H2, temperature, and ORP, providing accurate and reliable results for water quality monitoring. It features a backlit LCD display, auto-lock feature, and is suitable for use in aquariums, swimming pools, and other applications where water quality is crucial. The device is made of ABS material and requires a 3V button battery for operation. Its compact size and user-friendly interface make it an ideal tool for ensuring the purity and safety of water in various settings.