TPI 575C1 Air Velocity Meter features Increased versatility, uses both hot wire and vane type probes, Measure air velocity and temperature simultaneously, Record, minimum, maximum and average, Data hold, Auto power off (10 min.), Low battery display, Multiple units of measure: (m/s, k/h, mile/h, knots, ft./min), Download data to a computer using the RS-232 port and optional A500 cable, 39 inch cable length.