TPI 556C1 Vane CFM Thermo Anemometer measure air velocity, air flow and temperature, Five units of measure for air velocity: (m/s, km/hr, mile/hr, knots, ft/min), Two units of measure for air flow: (cfm, cmm), Send real time and logged data to a PC via optional A500 interface cable, Four digit dual line display simultaneously shows air flow and temperature, Data record displays minimum, maximum and average readings, Data log up to 1000 readings in 1 second to 999 second interv.