Meeting the need for a basic oscilloscope that can be adapted to a wide variety of monitoring tasks, the LBO-310A offers sufficient bandwidth, dc to 4 MHz. for many low frequency applications including audio and even video waveform observations. Because it is a recurrent sweep scope, it lacks a calibrated time base. However, many observations and tests do not require precise time measurements and even these can be arranged when the period of the observed signal is known. When used as an X-Y scope, the LBO-310A can be set up as a stereo monitor, Lissajous display, a phase indicator and a dedicated display for sweep alignment. A maximum sensitivity of 20 mV/div extends the range of applications.