Heavy-Duty Sling Psychrometer

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The uniquely compact Bacharach Sling Psychrometer accurately determines percent relative humidity without the necessity of consulting complex tables. Also, there is no need to wet the wick each time a reading is taken. The Psychrometer contains a slide rule calculator which correlates wet and dry bulb thermometer indications for direct reading of relative humidity. When not in use, the thermometer case telescopes into the handle for protection.


  • Designed for portability
  • Slide rule quickly converts temperature to relative humidity
  • Built-in water reservoir holds sufficient water for several hours of testing
  • Thin bulb design gives fast thermal response
  • Thermometers constructed of shock-resistant glass
  • Stems have deep-etched numerals for easy reading


  • Range: 20°F to 120°F (°C also available)
  • Dimensions: 7.5" long x 1" diameter
  • 1° scale divisions
  • Red spirit filled thermometer (Mercury also available)