4-in-1 digital pH tester, pH meter with LCD screen, high accuracy (0.01 resolution), water quality tester for drinking water, swimming pools, aquariums and hydroponic culture.

💧【4-in-1】Check the quality of your water, whether it comes from a tap, hot tub, homemade brew, indoor soil, aquarium, hydroponic system, or swimming pool. Plus, these pH tester pens are small, lightweight, and easy to carry when you're out and about.💧【High Precision】The pH meters range from 0.00 to 14.00 (pH). The pH resolution is 0.01 pH, the accuracy is ±0.01 pH, and the blue backlit LCD screen provides reliable and fast readings.💧【Easy Calibration】The pH tester automatically calibrates itself at three points. You don't need any tools; simply remove the protective cap and immerse the pH meter's 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 USE】 The pH tester features a self-calibration function so you can get a reading quickly. 💧【Wide Applications】 A single calibration powder can be easily stored in a drawer, bag, or suitcase for convenient portability. It is ideal for testing pH balance in drinking water, aquariums, swimming pools, spas, or hydroponic systems.