Panasonic HL-G1 Series User Manual page 27

Measurement of targets with level differences
When measuring a moving target that has level differences, set the direction of the
sensor head as shown below in order to minimize interference caused by the edges
of the target.
Measurement of targets in narrow space or slots
When measuring a target in a narrow space or slot, set the direction of the sensor
head as shown below in order not to block the light path between the emitter and
receiver.
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