The Dwyer 477AV-000 Handheld Digital Manometer, 0-1.000" wc, Air Velocity/Flow Modes includes pressure, flow, and velocity measurements along with a number of other convenient features. The built-in air velocity and flow calculations provide accuracy and conserve time and error associated with manual calculations, and have a velocity range of 1.266k fpm (64.33 m/s). Also featured on the 477AV000 are adjustable zero and span values for calibrating in the field, as well as a damping feature to compensate for reading fluctuations.