Compact Sling Psychrometer

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This compact Sling Psychrometer helps you accurately determine relative humidity values without having to consult complex tables.

Checking the difference between wet bulb and dry bulb temperature readings is a trusted method for measuring relative humidity. This pocket sized psychrometer with a built-in slide rule makes the measurements quick and easy, without sacrificing accuracy.


  • Easily fits in your pocket for portability
  • Built-in slide rule quickly converts temperatures to relative humidity
  • Organic liquid filled thermometers 
  • White backing for easier temperature readings


  • Ranges:
    • 20°F to 120°F (°C also available)
    • 10% to 100% R.H.
  • Resolution:
    • 1°F 
    • 2% R.H.
  • Accuracy:
    • ±1°F
    • ±5% R.H.
  • Weight: 0.15 lbs.
  • Dimensions: 8.3" x 1.4" x 0.6"



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Instruction Manual: