B&K Precision 2640 - Manual - Manual (Page 44)

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Marker
To know the magnitude of frequency, user can use the Squelch Marker.
And the Squelch Marker is the right Marker on the vertical axis of the
display window.
Also, user can set up the Squelch Marker for setting the Squelch Level of
Sweep mode and speaker output for a larger signal than Squelch Level
through modulation for audio frequency range. (Modulation: Frequency
modulation, Amplitude modulation, and SSB Modulation)
User can hear the radio using upper method.
Press the Marker (DEL) Key until the Marker mode icon is
changed to the Squelch Marker in the display window.
Squelch
Marker