Milwaukee MA840 Polarographic Dissolved Oxygen Probe

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SKU: MA840


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

The refillable polarographic 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 which the MW600 meter polarizes so that oxygen passing through the membrane can be measured to produce stable, accurate readings.

Design Features

  • 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.
  • Uses MA841 D.O. Replacement Membranes Only.



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