Nova
The Nova rulers are of a sandwich construction consisting of a copper scale, a scintillator layer and on top a visual scale. Four orientation markers that run along the rulers are included. They are placed at the borders of the light field. These markers are also visible on the X-ray image.
A camera is included to easy capture a video of the fluorescence without being in the room. Since the markers also are visible in the snapshot, you can easily see the deviation between the two fields.
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