Assman Psychrometer

This psychrometer has long been used as the standard wet & dry bulb psychrometer capable of measuring highly accurate humidity. Humidity of air can be precisely measured by this instrument. Two insulated type thermometers, as wet and dry bulbs, are located. By spring-wound, air movement is forced past the bulbs at a rate of about 3.5m/s to 6 m/s to ensure proper ventilation.