Check the listing for details. Extech 407119A Heavy Duty Hot Wire CFM Anemometer. Condition: Used. Listed at 250.00 USD. The 407119 Heavy Duty CFM Hot Wire Thermo--Anemometer uses a telescoping probe (extends up to 3 ft) which is ideal for use in ducts and ventilating systems. It can accurately measure Air Flow (CFM/CMM), Air Velocity and Temperature. Air Flow can be displayed as an instantaneous value or up to a 20 point average. Additional functions include Data Hold, Min/Max, and Auto power off. Comes complete with telescoping probe with 5.5ft cable, and 4 x AA batteries. Heavy Duty CFM Hot Wire Thermo-Anemometer uses a telescoping probe (extends up to 3-Foot) that's ideal for use in ducts and ventilating systems. It can accurately measure Air Flow (CFM/CMM), Air Velocity and Temperature. Air Flow can be displayed as an instantaneous value or up to a 20 point average. Additional functions include: Data Hold, Min/Max, and Auto power off. A built-in RS-232 interface can be used with optional Data Acquisition software and cable for recording measurements directly to your PC.