The 475A Portable Oscilloscope offers high performance and is light-weight for use in the field. It has a bright, 8 x 10 cm CRT. Its operation has been simplified by single-function push buttons, control knob design, layout and color coordinated front panel. The unit also measures with respect to the ground in many applications. This is controlled at the probe when DC coupled by simply pressing the small ground reference button on recommended probes. Dual trace with DC to 250 MHz bandwidth. Deflection factors of 5 mV to 10 V/div. Time base of 0.01 ?s to 0.5s/div with X10 magnifier. Delay sweep range of 50ns to 0.5s/div.