The model LBO-308S is a high-quality dual-trace, 20-MHz portable oscilloscope ideally suited for field service. It is an extremely compact, lightweight, general-purpose instrument, designed to provide accurate signal measurements for either bench or field service. The highly sensitive vertical amplifier provides calibrated deflection sensitivity from 2 mV/div to 10 V/div. The time base provides stable triggering over the full bandwidth of the vertical amplifier as well as calibrated sweep speeds from 0.2 sec/div to 0.5 µsec/div. A times 5 magnifier extends the maximum sweep speed to 0.1 µsec/div. The instrument may be operated from either 117/234 volts AC, 11 to 30 volts DC, or from battery pack. The model LBO-308 features a 3-inch rectangular 8 X 10 division CRT, mounted horizontally, with an internal graticule which provides for accurate and sharp displays at any viewing angle without parallax errors.