Fast easy to read results with large digital LCD readout. Extreme pH accuracy to ±0.1 pH with an extended pH range (-2.0 pH to 16.0 pH). Resolution to 0.1 pH. Lightweight and portable. Easy measurement: just place the probe in the sample, gently stir, wait for the stability indication to show a stable reading and then freeze the reading. Is fully compensated for temperature (ATC). Simple Automatic one or two-point calibration. 2 Sets of pre-memorized buffers. Gel-filled, double junction pH electrode for low maintenance and high performance. Over 300 hours of battery life (batteries included). Fully waterproof to IP65. Replaceable pH electrode Mi56P. The Milwaukee Waterproof pH55 PRO pH/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 aquariums, hydroponics, horticulture, education, pools, beer and many other applications. The Milwaukee Waterproof pH55 pH/temp. tester offers: Accuracy The Waterproof pH55 PRO tester is accurate to +/-0.1 pH and +/-0.5 DegC (+/-1 DegF) and is easy to read. With easy 2 point automatic calibration, this pH tester is quickly calibrated to an accuracy of much more expensive meters. Simple design and rugged, it brings great value for any application. Why guess at your readings using litmus paper when you can have guaranteed accurate, digital LCD results. Long life The tester comes with a replaceable pH probe with a double junction probe designed for longer life. Fast response The probe is double junction allowing quick, accurate pH readings and respose times. Waterproof construction No more worries about dropping your tester while measuring. The pH55 PRO is waterproof to IP65. Light weight At just 3.5 ounces, the pH55 PRO is easy to