It measures humidity
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Relative humidity
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There are a lot of places to buy a sling psychrometer. Any company which sells scientific equipment should have them, or one could buy it from Amazon or Bacharach.
Distilled water is used with a sling psychrometer because it ensures that there are no impurities or minerals that could affect the accuracy of the instrument. Impurities in water could lead to inaccurate readings when measuring humidity levels. Using distilled water helps maintain the sensitivity and reliability of the psychrometer.
To use a psychrometer, follow these steps: Wet the wick or sling of the psychrometer with distilled water. Swing the psychrometer in the air for a few minutes to allow evaporation to take place. Read the dry-bulb and wet-bulb temperatures from the psychrometer. Use these readings to calculate the relative humidity using a psychrometric chart or formula.