Bacharach 12-7012 Sling Psychrometer Temperature and Humidity Meter is a Red Spirit Filled (+25 to 120 F) meter that determines percent relative humidity without the need of consulting complex tables. This Sling Psychrometer contains a slide rule calculator which quickly converts wet and dry bulb readings into direct reading of relative humidity.The unit also slides into its case when not in use to keep it protected.
Proposition 65 Warning for California Residents: This product can expose you to chemicals including Benzene, which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to 
