1. Test the pH level and temperature of the solution/water with data hold function. 2. Pocket-sized, lightweight and portable with switchable backlight and large LCD display for easy reading. 3. Replaceable pH sensor probe - The electrode probe can be replaced with an insert type one for convenient replacement and. 4. ATC (Automatic Temperature Compensation) function, automatic calibration and fully waterproof IP65. 5. Apply to water sources, soilless culture, aquarium, hydroponics, laboratory, spas, swimming pools and other water systems. Color: White Material: Plastic Package Contents: 2 x 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 a little different from the real thing. The measurement allowed error is +/- 1-3 cm.