Starting at $6,257.00
  • Usually ships in 13-14 weeks



  • Chilled mirror hybrid sensor
  • Model type:
    • OPT401: Bench Top
    • OPT501: Wall Mount
  • Accuracy:
    • ±0.15°C dew point
    • ±0.1°C temperature
  • Measurement range: -40 to 248°F (-40 to 120°C)
  • Touch-screen HMI
  • Sensor types:
    • Polyoxymethylene (acetal, standard conditions)
    • PEEK (poly ether ether ketone, harsh environments)
  • Repeatability: ±0.05°C
  • Sensitivity: ±0.01°C
  • M36x1.5 process connection


The Michell Instruments Optidew Chilled Mirror Hygrometer is available in bench top and wall mount configurations, and features an intuitive touch screen interface for easy local operation. Using the latest developments in chilled mirror technology, it has a response speed comparable to polymer relative humidity sensors, combined with the reliability of drift-free measurements common to all chilled mirror instruments.

Applications for the Optidew include:

  • Reference humidity instrument for climatic and environmental chambers
  • Inlet air measurement for engine testing
  • HVAC testing
  • Environmental monitoring in clean rooms
  • Coating process monitoring – for confectionary and pharmaceuticals
  • Control of humidity for metallurgical processes