The CE31B FM Radio Test Set contains in a single unit the test instruments needed to check the operation on frequency modulated (FM) transmitters and receivers in the VHF/UHF range of 25 to 999.9999MHz. The unit provides a 200 mv typical uncalibrated high level Signal Generator output and a two microvolt high sensitivity Receiver input with which to easily tune and repair receivers with severely degraded RF or IF gain.