Fast and Accurate: High quality pH meter for quick calibration and extremely accurate results. Simply remove the protective cap and immerse the electrode in the solution you wish to measure. Multi-functional design: high-precision high-precision LCD display, responsive 0.01 high-precision precision and it is easy to read with the backlight. Convenient to Carry: This hydroponic pH pen is designed based on the perfect convenient size to carry in your pocket and test pH no matter where you are. Automatic temperature compensation. pH tester with automatic temperature compensation. This allows you to adjust water temperature and water quality and get corresponding adjusted pH values almost immediately . Widely application: for fishing, swimming pools, swimming pools, school laboratories, running water, aquaculture and other liquids.