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Milwaukee MA840 Polarographic Dissolved Oxygen Probe

SKU: 9139-MA840~ea

SKU: 9139-MA840~ea

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Milwaukee MA840 Polarographic Dissolved Oxygen Probe

The Milwaukee MA840 is a polarographic replacement probe for the MW600 Dissolved Oxygen meter.

The refillable probe has an oxygen-permeable polytetrafluroethylene (PTFE) membrane sensor for measuring dissolved oxygen (DO) levels in aqueous solutions.

The probe uses a platinum cathode and a silver chloride anode.  It polarizes the oxygen passing through the membrane so that it can be measured to produce stable, accurate readings.


  • Reinforced plastic body for durability
  • Built-in temperature sensor to achieve thermal equilibrium between the sensor and the sample for more accurate reading
  • 10 inches long with a tip that tapers from 1-1/2" to 3/4" in diameter
  • 10-foot cable with a 7-pin DIN connector for attaching to the meter


  • Body: ABS
  • Cathode: Platinum
  • Anode: Silver
  • Temperature Sensor: Yes
  • Warranty: 6 months