The B & K Model 1405 Oscilloscope is a highly sensitive, stable oscilloscope employing a 3" cathode ray tube. Its unique design permits easy operation. Make the most of your new B & K oscilloscope by carefully reading this instruction manual. Features • A vertical-axis sensitivity of better than-10 mV/DIV and a frequency response from DC to 5 MHz. • DC amplifiers are used for both vertical and horizontal axis. • All transistorized circuitry for low power consumption and low heat generation. • Compact and lightweight, easily portable. • Direct deflection terminals for the vertical axis are provided to permit measurements at high frequencies • The CRT uses a P31 (blue-green) phosphor to provide easier observation, excellent luminance and improve contrast.