HP E4418B Programming Manual page 245

DISPlay Subsystem
DISPlay:CONTrast <numeric_value>
Query
DISPlay:CONTrast? [MIN|MAX]
The query returns the current setting of the contrast or the values
associated with MIN and MAX. The response format is <NR3>.
Query Example
5-4
DISP:CONT?
This command queries the
current contrast setting.
HP E4418B/E4419B Programming Guide