This course discusses the principles of fluid flow and how primary devices affect fluid flow. It describes flow measurement using several kinds of secondary devices. It covers rotameters and other variable-area instruments. It explains how weirs, flumes, and other arrangements measure open-channel flow. It compares many kinds of positive-displacement meters and explains the operation of several kinds of turbine and magnetic flowmeters. The course describes less common flowmeters (including vortex-precession, mass flow, and ultrasonic devices) and instruments that meter the flow of solids. Finally, it provides guidelines for safe installation and maintenance of flow devices.