The Model 8321 velocicalc rotating vane anemometer fromTSI Incorporated(St. Paul, MN), is designed to measure air velocity and temperature. The 4-in.-dia vane head rotates 270 degrees to enable viewing of the LCD, regardless of measuring head orientation. The unit automatically performs maximum, minimum, and average velocity calculations and is suited for use on large grille faces, fume hoods, or other large openings.