Milwaukee MW105 MAX Waterproof pH/ORP/Temp Portable Meter

SKU: 9139-MW105~ea

Milwaukee MW105 MAX Waterproof pH/ORP/Temp Portable Meter

SKU: 9139-MW105~ea
Regular price $470.55 CAD
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Milwaukee MW105 MAX Waterproof pH/ORP/Temp Portable Meter

The Milwaukee MW105 MAX Waterproof 3-in-1 pH/OPR/Temp. meter is rugged, reliable, fast and simple to operate.  It is ideal for brewers, wine makers, growers, labs, food processing, water treatment and many other applications with challenging pH measurement needs. 

The meter has a 3-point calibration and 7 standard buffer choices.  It can be quickly calibrated to a higher accuracy compared with one or two-point calibration.  It is accurate to ± 0.02 pH., 5x more accurate than some alternative meters, and IP67 Waterproof rated. 


  • Fast, easy-to-read results with large duel level digital LCD readout
  • Extreme accuracy to ±0.02 pH | +/-0.5°C (+/1°C outside) | +/-1°F (+/-2°F outside)
  • Extended range (-2.00 pH to 20.00 pH)
  • Lightweight and portable, IP67 rated
  • Easy measurement: just place the probe in the sample, gently stir and wait for the reading to stabilize
  • Simple push button, automatic up to 3-point calibration for increased accuracy
  • Gel-filled, double junction amplified, rugged field design, with lab grade performance. MA906BR/1 pH electrode is low maintenance with high accurate results and has a screw on cap to ensure proper storage
  • Built-in temperature sensor
  • Battery life approx. 200 hours (battery included)
  • Auto shut off feature to preserve battery energy
  • Alphanumeric LCD display messages for friendly, intuitive information, warnings and error messages
  • Internal clock date to keep track of different time-dependent functions (calibration, timestamp, calibration time out)
  • 3-foot probe cables for extra flexibility when testing


  • pH Range*: -2.00 to 20.00 pH
  • pH Range Electrode: 0 to 12 pH
  • ORP Range: ±2000.0mV
  • Range Meter: -20.0 to 120.00°C (-4.0 to 248.0°F)
  • Range Electrode: -5 to 70°C (23 to 158°F)
  • Resolution: 0.01 pH
  • Resolution: 0.1mV
  • Resolution: 0.1°C (0.1°F)
  • Accuracy*: ±0.02 pH @ 25°C / 77°F
  • Accuracy: ±1mV
  • Accuracy: ±0.5°C (±1°C outside) | ±1°F (±2°F outside)
  • pH Calibration: up to 3-point automatic pH calibration | 7 standard buffers (pH 1.68, 4.01, 6.86, 7.01, 9.18, 10.01, 12.45)
  • ORP Calibration: Factory calibrated
  • Temperature Compensation*: Automatic, -20.0 to 120.0°C (-4.0 to 248.0°F) or manual (without temperature probe)
  • pH electrode: MA906BR/1 amplified pH/temperature probe (supplied)
  • Accuracy electrode: ±0.02 pH (range 0 to 12 pH)
  • Temperature probe: Built-in temperature sensor
  • Impedance: 10 Ohm
  • Battery type: 3 X 1.5V alkaline AA (included)
  • Battery life: Approx. 200 hours of use
  • Auto-off: Selectable 5, 10, 30, 60 min. or off
  • Environment: 0 to 50°C / 32 to 122°F; max RH 95%
  • Dimensions: 200 x 85 x 50 mm (7.9 x 3.3 x 2.0 inches)
  • Casing: IP67
  • Weight: .26 Kg / 0.58 lbs (with battery)
  • Warranty: 2 years, Meter

*Limits will be reduced to sensor limits

Milwaukee MW105 Manual


pH meters usually start performing poorly because of problems with the probe, specifically the glass sensing bulb and the reference junction.  The glass bulb loses sensitivity with use and will eventually fail, which is true of all pH probes.  The reference junction is a small hole that allows the meter to compare the sample to a reference.  If the junction hole gets clogged, the pH probe will no longer function.

The life of your pH electrode can be extended in the following ways:

  1. Storage - The pH probe needs to be kept hydrated. Long periods of dry storage will damage the sensitivity of the probe. Allowing the probe to dry out may also result in the junction hole getting clogged. Storing in pH probe storage solution MA9015 or pH calibration buffers will help address both these issues. Do not store in tap water and DI water, this will damage the sensitivity of the probe.  The best way to store the probe is with the probe's cap filled with storage solution or calibration buffer and the cap tightened to prevent leakage. It is also recommended to store the electrode upright to further reduce the potential for leakage.
  2. Cleaning - Residue from the sample can impact the sensitivity of the sensing bulb and clog the junction. This is especially true if the sample has a lot of organic material. It is recommended to regularly soak your electrode in cleaning solution MA9016.
  3. Calibration - The pH sensing bulbs become less sensitive over time so make sure that you are calibrating regularly to keep your PRO pH meter accurate. Also, calibrate after cleaning or a long period of storage.
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