Amazon.com has a sling psychrometer for sale.
A hygrometer can be used to measure relative humidity.A sling psychrometer consists of two thermometers mounted together with a handle attached on a chain.One thing is normal.The other has a cloth that covers its bulb.
How do you make a sling psychrometer?A double layer of gauze is moistened with water.The rubber band can be used to cover one of the thermometers.Attach the thermometer to the bottle with a piece of tape on one side and another on the other.
There is a sling Psychrometer.The Sling Psychrometer is an easy and affordable way to measure relative humidity levels.For dry bulb temperatures between 30 and 100 F, the Sling Psychrometer has an accuracy of 5%.It has a 1 year warranty.
There is a sling psychrometer.The instrument is used to measure the amount of water in the air.It is a combination of wet- and dry-bulb thermometers mounted on a frame with a handle that allows it to be swung around to allow air to move across the psychrometer.