Descriptions:  
MASTECH MS6252B Digital Anemometer Wind Speed Meter Air Volume Ambient Temperature Humidity Tester with USB Interface
This meter is a digital anemometer for measuring the ambient temperature, humidity, dew point temperature, wet bulb temperature, wind speed, and air volume.
Features: 
Professional digital anemometer with built-in high quality T&RH sensor which indicates air temperature and relative humidity. 
Can be used by hands and fixed on tripods and somewhere else. 
Easy to set area dimensions and to store them into the meter's internal memory for next power on. 
With large screen LCD display and backlight. 
Various units for options: units of area (m2, ft2), units of wind speed (m/s, km/h, mil/h, ft/h, ft/s, knots), units of air volume (CMS, CMM, CFM) and units of temperature (Celsius degree, Fahrenheit degree). 
Data holding and maximum and minimum value recording. 
Low battery indication. 
It can upload real time data to computers through USB cable. 
Supplied with a specially designed storage bag for you to carry and protect the instrument. 
Ideal instrument for windsurfing, sailing, fishing, kite flying and mountaineering, etc. 
Can also be used for industrial and home purpose such as measuring wind speed and temperature of CPU computer fans, air conditioners, air blowers, etc. 
It can be turned off by pressing the Power key. 
And it can also turn off its power automatically. You can long press the FUN button to open or close its function of automatic power off. 
Specifications: 
Wind velocity                                            Scope                                                Accuracy  
m/s (meters per second)                        0.40 - 30.00                                      ± 3%
ft/m (feet per minute)                               80 - 5900                                          ± 3%
km