The R4500SD-NIST is a handheld hot-wire thermo-anemometer with an SD-card data logger built in, so it records air velocity and air temperature straight to a memory card without any PC software. It reads air speed from 0.2 to 25 m/s (about 40-4921 fpm) alongside temperature 0-50C, and can auto-sample at operator-set intervals or capture up to 99 manual readings, with results exportable as an Excel file. Backlit LCD, Max/Min/Hold functions, and a slim folding hot-wire probe round out the design, and this unit ships with a NIST-traceable calibration certificate.