The temperature and dewpoint of the air (degrees), eventually indicating the
relative humidity (percent). Both are dimensionless numbers ... they have no
units.
The unit for a sling psychrometer is degrees Celsius (°C) for measuring air temperature and percentage (%) for measuring relative humidity.
It measures humidity
Relative humidity
The sling psychrometer was invented in 1887 by Adolph Richard Assmann, a German meteorologist. It is a simple instrument used to measure the relative humidity of the air.
Like in a Hygrometer to measure humidity you use percentage (%)
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:)
A
One of the better ways would be to use a sling psychrometer.
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.
A sling psychrometer measures relative humidity by comparing the readings of two thermometers, one dry and one wet. It works on the principle that the rate of evaporation is influenced by the humidity of the air.
A sling psychrometer was invented by James Hutton in the 18th century. It consists of two thermometers, one wet and one dry, attached to a handle and spun around to measure humidity levels in the air.