The model LBO-515B is a dualtrace, dual-time-base, 30 MHz portable Oscilloscope capable of delayed sweep operation. It is a compact, lightweight, general-purpose instrument, designed to provide accurate signal measurements in either lab or field service. The vertical Amplifier provides calibrated deflection sensitivity from 5 mV/div to 5 V/div. The time base provides stable triggering over the full bandwidth of the vertical Amplifier as well as calibrated sweep speeds from 0.5 sec/div to 0.2 usec/div (A sweep). A times 10 magnifier extends the maximum sweep speed to 20 nsec/div.