The 485 is a general purpose, environmentalized, high performance, portable, wide band oscilloscope Dual channel vertical amplifier with selectable input impedance. Bandwidth: 350MHz-. Sensitivity to 5 mV/div Selectable input impedance of 1 Mohm and 50-ohms. 1 nS sweep rate. Automatic deflection factor readout Will operate from 90 to 136 VAC in the 115 VAC mode or 180 to 272 VAC in the 220 VAC input mode, Additional features are X1, X10 and X100 probe scale factor readouts, 8 DIV X 10 DIV graticule area, small spot size and high writing rate. This oscilloscope came to us from a retiring electrical engineer who used this in his calibration and product development electronics lab.