Rohde & Schwarz CMS50 Radio Communication Service Monitor. Compact, versatile and full-featured Radio-telephone Tester. High-contrast backlit LCD screen with large characters and simultaneous indication of all settings and results. Numerous additional features such as spectrum monitor, oscilloscope, continuously tunable distortion meter, and adjustable AF filters. Full-duplex operation without compromise on measurements. Built-in automatic test routines for recurring test sequences.