Large, easy-to-read, backlit LCD simultaneously displays ambient temperature and airflow or air velocity. Memory stores eight area dimensions in ft2 or cm2. 20-point average function for airflow. 3% velocity accuracy via low-friction, 2.83"-dia. ball bearing vane wheel. Data hold and min. / max. functions capture measurements for easy data recording. Auto-off preserves battery life. Vane sensor with 3.9'L cable, 9V battery, protective rubber holster and carrying case included. CFM / CMM Thermo-Anemometer and IR Thermometer (No. 143495) adds a built-in, noncontact IR thermometer that safely measures remote surface temperatures up to 500°F (260°C) with 8:1 distance-to-spot ratio and laser pointer, great for hard-to-reach surfaces.