The SDL350-NIST records data on an SD card in Excel format. Air Velocity/Air Flow meter with telescoping probe designed to fit into HVAC ducts and other small openings. Telescoping probe extends up to 7.05ft (215cm) maximum length with cable. Adjustable data sampling rate. 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 or Air Flow and Temperature simultaneously. Record/Recall MIN, MAX, Data Hold and Auto power off. Complete with 6 x AA batteries, SD card, telescoping probe with cable, and hard carrying case. Includes certificate traceable to NIST.