Description: Material: ABC Model: YQ-03 Colors: orange, green, white Specifications: Features: 1. High precision: The tester has a sensitive electrode sensor that can read accurate pH levels; The accompanying detailed manual will show you how to achieve the best, accurate, and stable reading 2. Easy to calibrate: Press CAL for 5 seconds to enter calibration mode, take turns selecting powders corresponding to 6.86, 4.01, and 9.18 to complete calibration 3. Convenient to carry: Pocket size, lightweight, handheld design, easy to carry and convenient 4. LCD digital display: It can be easily used during the day or night, with accurate measurement and clear display effects 5. Widely used: suitable for household or commercial use, water, swimming pools, spa centers, liquid food, laboratories, hydroponics