The HM PH-200 is a professional IP67 waterproof handheld pH pen built for accurate liquid acidity and temperature detection, covering a full 0–14 pH measurement range with precise 0.01 pH resolution. Equipped with Automatic Temperature Compensation, it eliminates reading deviations caused by water temperature shifts, delivering stable, reliable test results for both commercial and home use.

Its large dual-display LCD screen shows pH and temperature data at the same time, with handy data hold, auto power-off and low-battery reminder functions for convenient field operation. The replaceable glass electrode extends service life, and the built-in buffer sponge in the protective cap keeps the sensor moist to avoid dry damage. Pre-calibrated at the factory, it supports one-touch digital calibration without extra tools.

Lightweight and fully submersible, this tester fits hydroponics, aquaculture, pool maintenance, lab analysis, wine brewing and drinking water inspection perfectly. It comes complete with AAA batteries, a hanging lanyard and calibration buffer, ready for instant out-of-box testing for water treatment merchants, farmers and lab technicians.