Large display of Airflow or Air Velocity with built-in InfraRed Thermometer. CFM/CMM Thermo- Anemometer with built-in non-contact IR Thermometer measures remote surface temperatures to 536F (280C) with 8:1 distance to spot ratio and Laser Pointer. Simultaneous display of Air Flow or Air Velocity plus Ambient Temperature. Easy to set Area dimensions (cm2) are stored in the internal memory for the next power on. Resolution of 0.01m/sec; 20 point average for Air Flow; Super large (9999 count) LCD Backlit Display; 3 percent velocity accuracy via low friction 2.83 inch D (72mm) ball bearing vane wheel on 3.9ft (120cm) cable; Complete with vane sensor with 3.9ft (120cm) cable, 9V battery, and protective rubber holster.