The B & K-Precision Model 1420 Dual-Trace Mini-Scope is a miniature, lightweight instrument for observing and measuring waveforms in electronic circuits. In addition to its portability it offers the high performance features usually found only in laboratory-quality scopes. The compact Model 1420 will fit easily into a standard attache case with plenty of room left over for the probes and other ac- cessories and tools, even a digital multimeter. The instrument weighs only 8 pounds with battery installed. This is a major con- venience when the mini-scope must be carried to an equipment site. For full versatility in its field service role, the unit operates from almost any power source. For operation from ac power, a 120-volt, 60 Hz ac adapter (or 220-volt, 50/60 Hz ac adapter) is supplied. An external de power jack allows the mini-scope to operate from an external de power source of 10 to 16 volts. This permits operation in a vehicle, or from the de power source of the equipment being serviced. The power drain is only 16 watts. If neither of these power sources is readily accessible, an internal battery supplies the power (optional accessory). As a standard feature, the battery charger circuit is built in, and recharging starts when reconnected to an ac source with the scope turned off.