4-in-1 Digital pH Meter, pH Tester with LCD Screen, High-Precision Resolution 0.01, Water Quality Tester for Drinking Water, Swimming Pools, Aquariums, Hydroponics

【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 Accuracy】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.