This 4in1 water tester is lightweight and portable, allowing you to easily carry it around in your pocket, whether you are at the pool, on a trip, at the beach or camping. Simple operation, you just need to immerse the electrode of the tester in the solution and wait for a few seconds to obtain the data on the LCD screen. Two specifications are optional, and you can choose SALT-785H or SALT-785 depending on your requirements. Wide applications, suitable for domestic water, aquarium, aquaculture, catering food industry, fishery, swimming pool. Features: 4in1 water tester, pen type design, lightweight and portable, allowing you to easily carry it around in your pocket, whether you are at the pool, on a trip, at the beach or camping. Simple operation, you just need to immerse the electrode of the tester in the solution and wait for a few seconds to obtain the data on the LCD screen. Designed with accurate electrode for precise measurement, with 0°C-80°C (32°F-176°F) wide measure ranges.