The Extech SDL300 records data on an SD card in Excel format. Metal wings withstand temperatures up to 70 °C (158 °F) and air velocities up to 6900 ft/min. The data logger stamps the date and time and saves the measured values on an SD card in Excel format for easy transfer to a PC. Adjustable data sampling rate from 1 to 3600 seconds. Stores 99 readings manually and 20 million readings on a 2G SD card. Type K/J thermocouple input for high temperature measurements. Large LC display (9999 counts) shows air velocity and temperature simultaneously. 2% velocity accuracy with low friction ball bearing impeller on a 1 m (39 inch) cable. Record/recall MIN, MAX, data memory, auto power off.