Description: 1.Display of air flow (CFM/CMM).Average 20 points, air velocity, while showing temperature 2.Celsius temperature / Fahrenheit temperature measurement conversion. 3.Large LCD and bright display back light. 4.Data hold and MAX/MIN.Low battery display and auto power off 5.Applications: 1)HVAC installation, repair, diagnostics and optimizatin. 2)Ventilation system installation, servicing and analysis.3 Environmental wind and temperature esting/analysis. 4 Boiler rooms. 5)Automobile aerodynamic testing. 6) Plant/facilities maintenance Specification: Model: HT-9819 1.Type: Digital anemometer 2. Material: ABS 3. Power Supply: 1 x 9V Battery ( not included) 5. Display:Dual function 0.5" 4-digit LCD 6. Measuring range: 0.4-30.00m/s 7. Resolution: 0.01m / s 8. Accuracy: ± (3% + 0.20m / s) 9. Response time: 1S 10.Operating temperature:32 °F~122 °F(0 °C~50 °C) 11.Storage temperature:14 °F~140 °F(-10~60 °C) 12.Operating humidity: