Features: The pH meter has an automatic temperature compensation feature that adjusts to water temperature and quality to give pH readings almost instantly. Plus, you can calibrate the tester with a touch button using the calibration pad powder. Ideal for home or lab use; Suitable for testing the pH balance of drinking water, swimming pool, aquarium, RO system, spa or hydroponics; Suitable for a wide range of applications. < br/> Simply remove the protective cap and immerse the electrode of the pH meter in the solution and press the button to measure. Beat the heck trying to see the colors of a sunflower strip. Remove the protective cap and turn the meter by pressing the ON/OFF key, immerse the electrode in the solution to be tested, stir gently and wait approximately 30 seconds until the reading stabilizes. /> Wash the electrode with distilled water and dry the glass probe with a soft cloth before replacing the protective cap for storage. And the test range is 0-14pH with 0.01pH accuracy, you can better know the liquid you are going to use.