Digital pH meter, high-precision pH tester (0.01 pH), 2% reading accuracy, water temperature tester, pH meters for domestic drinking water, swimming pools, hydroponics, and aquariums.

【4-in-1 pH Meter】 A great tool for checking your water quality, whether it comes from a tap, hot tub, homebrew, indoor soil, aquarium, hydroponic system, or swimming pool. Plus, these pen-style pH testers are small, lightweight, and easy to carry when you're out and about! 【High Accuracy】 The pH meter ranges from 0.00 to 14.00 (pH), while the digital EC and TDS meters range from 0 to 9999 ppm. The pH resolution is 0.01 pH, with an accuracy of ±0.01 pH. 【Easy Calibration】 The pH tester automatically calibrates itself at three points. No tools are needed; 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. 【Quick Operation】The pH tester features a self-calibration function so you can get a reading quickly! 【Wide Application】You will receive: 1 pH tester, 3 calibration bags, 2 spare batteries, and instructions. Suitable for home and laboratory pH testing, including drinking water, plating baths, aquarium water, swimming pool water, well water, deep-sea diving, aquaculture, food processing, etc.