LeCroy Digital Oscilloscopes, Manual

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The VOLTS/DIV controls give a vertical gain selection of 2 mV–5
V/div, operating in a 1–2–5 sequence. To reduce the sensitivity:
Turn and set the gain to 500 mV/div. The selected
volts/div setting is shown in the Channel 1 trace label.
To fine-tune the vertical gain: Press the button.
Turn through several complete rotations, so that
the entire signal reaches from top to bottom of the grid.
The volts/div setting still shows in the trace label
Filling the grid in this way ensures that the signal uses the full range
of digitizing levels available —
8 bits = 256 levels — for the best
vertical resolution.
To return the vertical gain to its 1–2–5 sequence: Press
again.
The knob controls the vertical position of the acquired
race.
Note the ground marker for Channel 1, , next to the menus.
Press to see that its channel, too, has a trace label.
Press again to turn off Channel 2.