The Type 535 and 545 are high-speed laboratory oscilloscopes. Their fast risetime coupled with wide sweep-speed range and 10-kilovolt accelerating voltage opens the way to faster, easier analyses of fast-rising waveforms. Additional adaptability is provided by plug-in preamplifiers which extend their use to almost all laboratory-oscilloscope applications. Accurately calibrated sweep speeds and vertical-deflection sensitivity permit quantitative time and amplitude measurements to be made. Accurately-delayed trigger sweeps make possible the selection and detailed observation of minute portions of voltage waves.