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Milwaukee SE300 Lab Grade Double Junction ORP Platinum Probe

SKU: 9139-SE300~ea

SKU: 9139-SE300~ea

This product may be backordered. General ETA is 10-14 business days for delivery. Please feel free to contact us: or 1-800-535-3751 to confirm stock / lead time. We appreciate your business!

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Milwaukee SE300 Lab Grade Double Junction ORP Platinum Probe

The SE300 probe is designed for use with the Milwaukee MW500 PRO ORP Meter.

The resin body is highly durable, chemically resistant, and protects against accidental damage while the double junction design reduces the risk of clogging.  The combination electrode contains both the measuring half-cell and the refence half-cell to minimize electrostatic interference and provide consistent readings.  The gel filled design feature removes the need to maintain electrolyte levels. 


  • Body: Resin
  • Reference: Single, Ag/AgCl
  • Junction: Ceramic, single
  • Electrolyte: Gel
  • Max pressure: 2 Bar
  • Range: ORP: ±2000 mV
  • Tip Shape: Platinum pin
  • Diameter: 0.5 inches
  • Dimensions: 4.7 inches / 6.4 inches
  • Operating Temperature: -5 to 70°C (23 to 158°F)
  • Cable length: 3.3 feet
  • Connection: BNC


Properly maintaining the ORP probe will provide fast, accurate results for longer.  Here are tips to keep the probe working properly:

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