Cryogenic Frost Point Hygrometer

SKU: 39 Category:

The Cryogenic Frost Point Hygrometer (CFH) is a sonde that accurately and precisely measures water vapor at elevations from the earth’s surface to the mid-stratosphere. Measure the amount of water vapor inside ice clouds or perform dehydration studies in tropical areas. The CFH is also great for validating satellite measurements and humidity sensors on radiosondes.

Included Items

  • EN-SCI CFH Sonde
  • Polystyrene Foam Flight Box
  • Lithium Metal Batteries
  • Inlet Tubes
  • Technical Support


EN-SCI warrants this product to be free of defects in material and workmanship for up to one year from the shipped date or first flight, whichever comes first. For support assistance please email us at

Product Information

Measured ParametersAmbient Frost Point
Derived ParametersRelative Humidity, Mixing Ration
TechniqueTemperature-controlled chilled mirror
Uncertainty Measurement4% in tropical lower troposphere,
10% in middle stratosphere,
9% in tropopause
Altitude Range0 - 25 km (all climates)
Weight< 400 g (without coolant)
Instrument Dimensions7.6 cm x 7.6 cm x 13.3 cm
Dimensions (in Flight Box)~12" W x 12" D x 12" H (~39cm x 39cm x 39cm)
*Product information is subject to change without notice.

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