The Dwyer 477AV-3 Handheld Digital Manometer, 0-200.0 psi, 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 56.63k fpm (287.7 m/s). Also featured on the 477AV3 are adjustable zero and span values for calibrating in the field, as well as a damping feature to compensate for reading fluctuations.