SoundCraft SM12 User Manual page 6

Metering
Each input module has its own 8-segment bargraph meter and peak level indicator
adjacent to the fader. The groups are metered by 16-segment bargraphs which are
next to the faders on the output modules.
The two 16-segment bargraphs on the Master module meter either the PFL/AFL
signals or the Stereo Mix signal depending on the wedge default internal setting.
Introduction 3