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 & ±0.5°C (+/-1°F) 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 handle at up to half the weight of other testers.

Ease-of-use
A large Dual Level LCD screen with easy-to-read graphic symbols, makes it easy while calibrating or reading your measurement. This takes the takes the guess work out of litmus paper.

Design features

• 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.
• Acid Based calibrations, cleaning & storage solutions use PH-START  add MA9010 (10.01 cal. buffer) or M10010B if Basic cal. required.
• 2 Sets of pre-memorized buffers. (pH 4.01, 7.01, 10.01 or 4.01, 6.86, 9.18)
• 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.
• pH Range:-2.0 – 16.0 pH
• Resolution:0.1 pH
• Accuracy:±0.1 pH
• Calibration:Automatic 1 or 2 point with 2 sets of pre-memorized buffers (pH 4.01, 7.01, 10.01) or (pH 4.01, 6.86, 9.18)

Care and Use
All pH sensors have a limited life and response time gets longer with age. Properly maintaining your pH pen tester will give you fast, accurate results for longer. So, be sure to order the Milwaukee pH Maintenance Kit code PH-Main at checkout time!  This will be needed to help clean and condition the pH electrode before use!

Store the pH probe in storage solution MA9015.  Only use tap water short-term if MA9015 is not immediately available and NEVER store in distilled Water (DI) or Reverse Osmosis (RO) water. This will damage the sensitivity of the probe.

Here are our top four tips. 

1. Always store upright with the cap full of MA9015 Storage solution for BEST RESULTS.
2. Clean your Tester regularly by soaking in cleaning solution MA9016. Cleaning Solution for about 20 minutes.
3. Calibrate after cleaning and/or storage before testing to adjust for changes in the pH sensor.
4. Gently stir the Tester in the sample for a faster result.