Tenmars TM-4002 Hot Wire Anemometer Air Flowmeter With Measuring  Range 0.01 40 m/s  Introduction:        - Fast response telescoping probe.        - Air flow volume.         - Large LCD display.        - Displays air (wind) speed in meters/second,feet/minute, kilometers/hr, knots, and miles/hr.        - Displays maximum and minimum readings and holds any reading.        - Manual Data Memory and read fucntion (99 records). (TM-4001/TM-4002)        - Dew point, Wet Bulb calculation. (TM-4002)         Applications:  · HVAC system performance  · Commissioning  · Plant maintenance  Specifications:        - Size : 156 x73 x35 mm (L xW xH).        - Weight : 250g.        - Power: LR6 (AA) 1.5V x6 Batteried(not included package)        Air Flow (volume) Calculation:                 Unit     Range     Resolution      Accuracy           CMM     0~9999     0.1                CFM     0~9999     0.1              Temperature Measurement:            Unit     Range     Resolution     Accuracy                 -20~60     0.1     ±1                -4~140     0.1     ±1.8         Humidity:            Unit     Range     Resolution     Accuracy           %RH     20~80     0.1     ±3.5%RH           %RH     80     0.1     ±5%RH          Air velocity Measurement:           Unit     Range     Resolution     Accuracy           m/s     0.01 to 40 m/s     0.01     ±3% of reading±1%FS           Km/hr(kph)     0.02 to 144 km/hr     0.1           mph     0.12 to 89.5 MPH     0.1           Knots(kts)     0.01 to 77.