Item: Anemometer MV-QDF-6 Telescoping probe is ideal for measuring in HVAC ducts and other small vents; Extends up to 1m long. Data hold to freeze the displayed value. Four digital LCD display Measure range: 0.05~30 m/s 5-6V rechargeable battery operated High resolution of 0.01m/s Basic accuracy: ≤ 3% full scale Dimension: 190× 90× 40mm) Working environment: Temperature: -10~40degree, Humidity: ≤ 85%RH, Air pressure: 970 ~1040hPa Weight: 380g