Wattmeter

An instrument which measures one or more different electrical power quantities (such as decibels and watts), and is calibrated using watts. The power measurement and/or calibration may be displayed in multiples and/or submultiples thereof on a dial and/or digital readout display. For items designed to measure radio frequency power see test set, electrical power and meter, multiple scale. Excludes: ammeter; frequency meter; multimeter; voltmeter.