Wohler FA 410 Fan anemometer

Used to measure the air speed, temperature, and humidity.
Can be connected to a cone or funnel to measure the volume flow of air vents.

Range
Flow velocity: 0.5-30 m/s
Volume flow: 0-99,999 m3/h
Temperature: -20 to 60 Celsius

Resolution
Flow velocity: 0.1 m/s
Volume flow: 0.1 (0-9,999) or 1 (10,000-99,999)
Temperature: 0.1C/F

Accuracy
Flow velocity: ±(1.5% of reading + 0.3m/s) for under 20m/s, ±(3% of reading + 0.3m/s) for above 20m/s
Temperature: ±0.6C