The model YO-lOO Monitorscope is a measuring equipment lor radio amateur use. This instrument consists of a monitor of "on the air'1 signal and an oscilloscope. A two tone signal generator is buit-in for single sideband transmitter adjustment. The main function of the monitors cope is to monitor the transmitted signal on the scope, and it can also be used to observe the signal received with an optional receiver adaptor kit. The cabinet and front panel design of the YO-lOO matches that of FT-101B/277B and FT-201 series of amateur SSB equipment.