To have full control of the events created by the instrument you can show them in the level versus time diplays. You can enable for the marker added when the instrument is running on battery and for the events enabled in the trigger menu.
Marker Reaction Time
To be able to position the manually added markers precisely you can enable the marker reaction time. Select the delay in seconds between one and ten seconds. The delay can be changed while measuring. In the level versus time display an orange cursor will be displayed at the position where the marker is added.