The PH-686 portable digital water quality monitor combines four essential testing functions: pH, TDS, EC and temperature, replacing multiple single-function meters to deliver full water analysis in one slim pen-shaped device. Equipped with high-sensitivity electrodes and built-in ATC automatic temperature compensation, it eliminates temperature interference to deliver stable, precise readings for all liquid samples, covering a full 0–14 pH testing range with 0.01 pH resolutionAlibaba.co….

Its bright backlit LCD screen displays real-time data clearly even in dim light, paired with practical functions including data hold, one-touch calibration and auto power-off to simplify field measurement and data recording. Crafted with durable corrosion-resistant ABS housing, the compact pocket-sized body enables effortless carrying for on-the-go detection anytime.

Pre-calibrated at the factory for out-of-box use, this reliable tester fits perfectly for drinking water safety inspection, aquarium care, swimming pool maintenance, hydroponic planting and light lab analysis. It is a cost-effective essential tool for household users, aquarists, growers and water treatment workers.