Milwaukee pH58 MAX Waterproof 3-in-1 pH/ORP/Temp Tester with Replaceable Probe

SKU: 9139-PH58~ea

Milwaukee pH58 MAX Waterproof 3-in-1 pH/ORP/Temp Tester with Replaceable Probe

SKU: 9139-PH58~ea
Regular price $242.42 CAD
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Milwaukee pH58 MAX Waterproof 3-in-1 pH/ORP/Temp Tester with Replaceable Probe

The Milwaukee pH58 MAX Waterproof 3-in-1 pH/ORP/Temp. tester is accurate, cost effective, well rounded, rugged and reliable.  It features dual level LCD readouts, an 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.

The pH58 MAX Waterproof 3-in-1 tester is accurate to ±0.05 pH | +/- 1000 mV | +/-0.5°C (+/-1°F) and is easy to read.  The tester comes with a replaceable pH probe with a double junction probe designed for longer life.  At just 3.5 ounces, the pH58 MAX is easy to handle at up to half the weight of other testers.


  • Fast easy to read results with large digital LCD readout
  • Extreme pH accuracy to ±0.05 pH and +/- 2 mV with an extended pH range (-2.0 pH to 16.0 pH)
  • Extended Resolution to 0.01 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 250 hours of battery life (batteries included)
  • Fully waterproof to IP67
  • Replaceable pH electrode Mi58P


  • pH Range: -2.0 to 16.0 pH
  • ORP Range: ±1000 mV
  • Temperature Range: -5.0 to 60.0°C (23 to 140°F)
  • pH Resolution: 0.01 pH
  • ORP Resolution: 1 mV
  • Temperature Resolution: 0.1°C (0.1°F)
  • pH Accuracy: ±0.05 pH @25°C (77°F)
  • ORP Accuracy: ±1 mV
  • Temperature Accuracy: ±0.5°C (±1°F)
  • Typical EMC Deviation: ±0.02
  • Typical EMC Deviation: ±2 mV
  • Typical EMC Temperature Deviation: ±0.3°C (±0.6°F)
  • Temperature Compensation: Automatic from -5 to 60°C (23 to 140°F)
  • Calibration Automatic: 1 or 2 points with 2 sets of pre-memorized buffers (pH 4.01, 7.01, 10.01) or (pH 4.01, 6.86, 9.18)
  • Probe: Replaceable double junction for extended life (Mi58P)
  • Environment: -5 to 50°C / 23 to 122°F; max RH 100%
  • Battery Type: 4 x 1.5V; IEC LR44, A76 (included)
  • Battery Life: Approx. 250 hours of use
  • Auto-off: after 8 minutes on non-use
  • Dimensions: 7.9 inches × 1.5 inches (diameter)
  • Weight: 3.5 ounces (99.22 g)

Milwaukee PH58 Manual


All 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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