The Extech SDL310 records data on an SD card in Excel format. Measures Air Temperature to 122°F (50°C) and air velocity to 4930ft/min. Stores 99 readings manually and 20M readings via 2G SD card. Stores 99 readings manually and 20M readings via 2G SD card. Type K/J Thermocouple input for high temperature measurements. Large (9999 count) LCD displays Air Velocity and Temperature simultaneously. 2% velocity accuracy via low friction ball bearing vane wheel on 39 in. (1m) cable. Record/Recall Min, Max, Data Hold and Auto power off. Adjustable data sampling rate. Built-in PC interface.