B&K Precision 2640 - Manual - Manual (Page 42)

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Marker
Press the Marker (DEL) Key until the Marker mode icon is
changed to Delta Marker in the display window. And in this case,
Marker 2 is added.
The Marker mode is the total four modes. And the changed order of
Marker mode is as below:
Center
 Marker 1  Delta Maker  Squelch Marker
When user set up the Delta Marker, the frequency value and level value
of Marker 2 are displayed in the frequency input window. The frequency
value and level value of Marker 1, and the difference level value between
Marker 1 and Marker 2 are displayed in the Marker window
Delta Marker
To handle the Marker 1, user can set up the marker 1 in Marker mode 1
To handle the Marker 2, user can set up the marker 2 in Delta Marker