Psychrometer: Analog Sling, 0 to 100% RH, °F (SP100FR) Red Spirit Filled with Wet & Dry Bulb Thermometers

The sling psychrometer determines % of Relative Humidity by measuring the evaporation of water into the surrounding air. Two thermometers are placed in flowing air; one of these thermometers is covered with a wick which is kept moist with clean water. Evaporation from the wetted bulb causes its temperature to be depressed relative to that of the dry bulb.

Features:

• High impact plastic construction
• Classic twirling design
• Slide rule calculator integrated into the psychrometer
• Fast, Accurate & Easy to Use
• No assembly required
• ºF red spirit filled
• Temperature range: -20° to 120° F
• Humidity range: 0 to 100% RH
• Includes thermometers and (1) wick & instructions