The Milwaukee PH58 MAX Waterproof 3-in-1 pH/ORP/Temp. Tester is one of our most accurate cost effective, well rounded, rugged and reliable testers in the market featuring dual level LCD readouts, easily replaceable probe and extended pH ranges to meet almost any application. It's simple 1 or 2 point automatic calibration is simple-to-use and offers TWO sets of memorized buffers to select.  Ideal for use in beer, food, wine, education, water treatment, pools and many other applications.