High AccuracyThe pH meter range is 0.00-14.00 (PH). The pH resolution is 0.01 pH, the accuracy is 0.01 pH, blue backlit LCD display, reliable and fast readings.Four in OneCheck the water quality, whether it comes from the tap, hot tub, home brewed water, indoor soil, aquarium, hydroponics or swimming pool. In addition, the PH test pen is small and lightweight, making it easy to carry when going out.Easy to CalibrateThe pH tester calibrates automatically at three points. You don't need any tools; just remove the protective cover and immerse the pH meter electrode in the solution. Press "ON/OFF" to turn on the electronic pH meter, stir gently and wait a few seconds until the reading stabilizes. Easy to UseThe pH tester has a self-calibration function so you can get readings quickly. Wide ApplicationThe pH tester can be easily stored in a drawer, bag or suitcase, making it convenient to carry. It is ideal for testing the pH balance in drinking water, aquarium, swimming pool, spa or hydroponic water.