This precision unit measures air flow volumes up to 2.5 million CFM (72,000 CMM), and features a hot wire sensor that handles even the lowest air speeds with 3 percent accuracy. Includes 8:1 IR thermometer with laser pointer that measures: -25 to 999F (-32 to 537C), and allows precise capture and logging of up to 20,000 data points via the USB interface. Ideal for measuring speed, volume and temperature of slow-moving air.