Campbell Scientific PWS100 Present Weather Sensor - Manual (Page 14)

Section 2. Cautionary Statements
If the laser is operated outside of the housing then the following warning
applies:
INVISIBLE LASER RADIATION
AVOID EXPOSURE TO BEAM
CLASS 3B LASER PRODUCT
Check that the laser warning label on the sensor is still
visible and can be clearly read on an annual basis.
When installing the sensor avoid pointing the laser
housing towards areas where binoculars are in
common use. WARNING
2-2