The REED R4500SD is a real-time data-logging hot-wire thermo-anemometer that records air velocity and air temperature, plus contact temperature via an integrated Type J/K thermocouple input. Readings can be logged automatically to a removable SD card at sampling rates from 1 to 3600 seconds, or captured manually up to 99 points, and are shown on a backlit LCD. Well suited for HVAC airflow and ventilation testing.