Versatile: Ideal for home or laboratory use; ideal for testing pH balance in drinking water, pools, aquariums, RO systems, spas, or hydroponics; suitable for a wide range of applications FAST AND ACCURATE: Make sure your pool, general hydroponic pH, and even drinking water are perfectly pH-balanced and safe with the tester's precise pH accuracy. The tester has a sensitive electrode sensor for accurate pH readings. The included detailed manual will show you how to get the best accurate and stable readings AUTOMATIC CALIBRATION: The pH meter features automatic temperature compensation that adjusts to water temperature and quality to give a pH reading almost instantly. In addition, you can calibrate the tester with one touch of a button using buffer powder. EASY TO USE: Simply remove the protective cap, dip the pH meter electrode into the solution, and press the button you want to measure. It's such a hassle trying to see the color of the litmus paper