Delta RetroSign GRX-1 User Manual page 54

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Calibrate the GRX: Press 'Dark calibration' and follow the instruction on the screen (i.e. point the
instrument in a direction with nothing 10 m/33 feet in front of it and away from any light source).
•
Press the trigger (or press 'Calibrate') to calibrate.
•
When the message 'Dark Calibration completed' appears on the screen, press 'Next' to complete
the dark calibration session.
RetroSign GRX User Manual / December 2017
54
DELTA