The testo 410-2 handheld anemometer with humdity is  both accurate and affordable. Good things do come in small packages.  This air and humidity meter is simple to use and feature packed. The testo 410-2 velocity and humidity instrument has the same superior vane sensor technology found in Testo’s comprehensive line of vane anemometers. Combine that with reliable temperature and humidity measuring, and you've got the primary comfort measurements in the palm of your hand.  As an added benefit, this handheld anemometer with humidity measurement calculates dew point and wet bulb. 

Features:

• Integrated RH sensor provides %rH, wet bulb, and dew point readings
• Small 1.5 inch vane meter
• Hold, Min, Max, and Timed averaging
• Lens cover and leather belt case keep it protected - even in your tool box