1. Test the pH level and temperature of solution/water with data hold function. 2. Pocket size, and portable with switchable backlight & large LCD display for clear reading. 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. 5. Apply in water sources, soil-free growing, aquarium, hydroponics, laboratory, spas, swimming pools and other water systems. Colour:As Shown Material:Plastic Package Contents: 1 * Tester Pen Probe Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.