The SWR-200 is an easy to use and high sensitive standing wave ratio and power meter for practical use by radio amateurs. It is designed for measuring the forward and reflected power of standing waves caused between a transmitter and an antenna and also monitoring the impedance matching of an antenna for a transmission line. The two meters balanced mechanically and electrically, one for the forward power and the other for the reflected one, read the standing wave ratio directly without a switch. The tube type directional coupler for reducing inductive and capacitive reactances to a minimum is useful in the VHF range The push button switch for selecting the impedance of 75Ω or 52Ω is useful in mobile radio stations as well as fixed radio ones.