3. Replaceable pH sensor probe - The electrode probe can be replaced with insert type design for convenient and fast replacement. 4. ATC function (automatic temperature compensation), automatic calibration and IP65 fully waterproof design. 2. Pocket size, and portable with switchable backlight & large LCD display for clear reading. 1. Test the pH level and temperature of solution/water with data hold function. 5. Apply in water sources, soil-free growing, aquarium, hydroponics, laboratory, spas, swimming pools and other water systems., Weight: 0.04960400895 Pounds, Manufacturer: Jaywool