Milwaukee MW500 PRO ORP Meter

SKU: 9139-MW500~ea

Milwaukee MW500 PRO ORP Meter

SKU: 9139-MW500~ea
Regular price $196.28 CAD
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Milwaukee MW500 PRO ORP Meter

The Milwaukee MW500 PRO ORP meter is one of Milwaukee's most popular meters.  It has a reliable, fast and simple operation and is accurate to ±5 mV.  It is ideal for aquariums, swimming pools, spas and other water quality monitoring uses.  It can also be used to measure sulfur dioxide in wine using the manual Ripper titration method.  

It comes with a SE300 ORP probe that is low maintenance and able to withstand more challenging samples.


  • Fast, easy-to-read results with large digital LCD readout
  • Accurate to ±5 mV
  • Gel-filled, double junction lab grade Platinum ORP electrode for low maintenance and high performance
  • 3-foot probe cable for extra flexibility when testing
  • Auto shut off and low power demand for a 300-hour extended battery life (battery included)


  • mV Range: ±1000 mV
  • mV Resolution: 1 mV
  • mV Accuracy: ±5 mV
  • ORP Electrode: SE300 (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
  • Dimensions: 5.7 x 3.1 x 1.6 inches
  • Weight: 7.8 ounces (with battery)

Milwaukee MW500 Manual


Properly maintaining the ORP probe will provide fast and accurate results for longer.

Here are three tips to extend the life of your probe: 

  1. Always store with the cap full of buffer or storage solution, not water.
  2. Clean the probe regularly by soaking in cleaning solution.
  3. Calibrate after cleaning and/or storage before testing to adjust for changes in the ORP probe sensor.
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