Milwaukee PH55 PRO Waterproof pH & Temperature Tester with Replaceable Probe

SKU: 9139-PH55~ea

Milwaukee PH55 PRO Waterproof pH & Temperature Tester with Replaceable Probe

SKU: 9139-PH55~ea
Regular price $100.15 CAD
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Milwaukee PH55 PRO Waterproof pH & Temperature Tester with Replaceable Probe

The Milwaukee Waterproof pH55 PRO pH/temperature tester is accurate, cost effective, well rounded, rugged and reliable.  Ideal for use in aquariums, hydroponics, horticulture, education, pools, beer and many other applications.

It features dual level LCD readouts, an easily replaceable probe and extended pH ranges to meet almost any application. It's 1- or 2-point automatic calibration is simple-to-use and offers two sets of memorized buffers to select. 

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.


  • 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
  • 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


  • pH Range: -2.00 to 16.00 pH
  • Temp Range: -5 to 70°C
  • pH Accuracy ±0.02 pH
  • pH Resolution: 0.01 pH
  • pH Typical EMC Deviation: ±0.2 pH
  • Temp Resolution 0.1°C
  • Temp Accuracy (@25°C): ±0.5°C
  • Temperature Compensation: Automatic, 0 to 70°C
  • Temp Typical EMC Deviation: ±0.5°C
  • Calibration: Automatic, 1 or 2 points
  • pH Electrode: SE220 (included)
  • Temperature: Probe MA830R (included)
  • Environment: 0 to 50°C / 32 to 122°F; max RH 95%
  • Battery Type: 1 x 9V (included)
  • Battery Life: Approx. 300 hours of continuous use
  • Auto-off: After 8 minutes of non-use
  • Approximate dimensions: 5.7 x 3.1 x 1.6 inches
  • Weight: 1.1 lbs with battery

 Milwaukee PH55 Manual


pH sensors have a limited life and response time gets longer with age. Properly maintaining your pH Tester will give you fast, accurate results for longer.

You can extend the life of your pH electrode in the following ways:

  1. Always store with the cap full of buffer or storage solution MA9015 not water.
  2. Clean your tester regularly by soaking in cleaning solution MA9016
  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.
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