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Sensor-error messages
List of the "Measurement not possible" messages:
Error message
Counter measure
Image too dark.
Light up staff.
Image too bright.
Darken staff or reduce lighting to staff.
No staff or staff covered or insuff. code length.
Check targeting.
Distance out of measuring range.
Move staff or instrument closer together.
Staff inverted or wrong INV setting.
Check staff position and INV-setting.
Bad focussing.
Check focus.
Compensator out of range.
Level instrument.
