Regular laser safety precautions should apply. Please note, that the main incident beam will exit the LBS-400 refracted approximately 6°. Provision must be made to safely contain the transmitted beam by beam dump or power meter.

The beam blocker is designated to keep one wedge surface protected during handling and shipping. It can be left attached for low power laser operations. However, in the case of high-power laser irradiation scattered light might interfere with beam profile measurement and cause offset. In case of such offset, we recommend removing the beam blocker.

After removal, an additional laser output, having less than 0.1% of incident beam power will be reflected. That beam could be used for simultaneous measurement of laser power via Ophir Power Meter in addition to beam profiler.

Yes, the main function of LBS-400 beam splitter is Beam profiling, however, it performs a 3-way beam splitting:
Less than 0.01% (1/10³) of the beam is reflected in one direction and less than 1% in another while the remaining 99% of the incident laser beam is transmitted.
This allows user to measure one of the 3 beams, depending on available power measurement equipment and setup convenience.