Extech SDL310 Thermo-Anemometer Datalogger measures air temperature (up to 122 °F) and air velocity (up to 4930ft). Capable of storing 99 readings manually or up to 20M readings via 2G SD card. The Extech SDL310 Thermo-Anemometer/Datalogger uses Type K/J Thermocouple inputs for high temperature measurements.