Which of the following is not a lab scope adjustment?

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A lab oscilloscope is adjusted to control how voltage signals are displayed and measured. The vertical controls set the voltage scale (volts per division), the horizontal control sets the time base (time per division), and the vertical position (height) moves the trace up or down on the screen for proper viewing. There isn’t a knob for amperage level on a scope, because current isn’t a direct display parameter—you measure current by using a current probe or a shunt that converts current to a voltage the scope can read, often with its own scaling. So amperage level isn’t a lab scope adjustment, which is why it’s the correct choice.