It measures humidity
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.
There are two types - the wet-bulb sling psychrometer and the dry-bulb psychrometer. Look up the definitions of these instruments for more details.
Relative humidity
when was the sing psychrometer invente
A sling psychrometer (which is a hygrometer) measures the moisture content of the atmosphere surrounding it. It is called a sling psychrometer because it is whirled around in the air until a constant value/reading is obtained from the wet-bulb thermometer.
At Hardwere Stores:)
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One of the better ways would be to use a sling psychrometer.
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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.
it has changed a lot
The temperature and dewpoint of the air (degrees), eventually indicating the relative humidity (percent). Both are dimensionless numbers ... they have no units.
Like in a Hygrometer to measure humidity you use percentage (%)
One of the better ways would be to use a sling psychrometer.