Bacharach 0012-7043 Sling Psychrometer Red Spirit Filled measures percent Relative Humidity (-5° to +50°C) accurately without the complex tables necessary with other analog psychrometers. The wick does not need to be wet with each measurement and a slide rule calculator is included to correlate dry and wet bulb thermometer indications for direct relative humidity readings. Bacharach 0012-7043's case telescopes into the handle for protection when not in use.
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 
