What item of test equipment contains horizontal and vertical channel amplifiers?

An oscilloscope is a vital piece of test equipment used to visually display electrical signals over time. It operates by plotting voltage on a two-dimensional grid on a display screen. The vertical channel amplifier controls the Y-axis, representing the voltage amplitude of the signal. The horizontal channel amplifier controls the X-axis, which typically represents time (the sweep rate). Other instruments listed, such as an ohmmeter (measures resistance), ammeter (measures current), or signal generator (creates test signals), do not use X-Y graphical displays with horizontal and vertical amplifiers to visually trace signals.