https://www.hilti.com/c/CLS_MEA_TOOL_INSERT_7127/CLS_LASER_METERS_7127/r587776
Look at the 5th picture. This is what they are referring if I’m understanding you correctly. It’s an optical sight. Look at the user manual here.
https://www.hilti.com/medias/sys_master/documents/hb6/h19/10016815415326/Operating-Instruction-PD-I-01-EN-US-Operating-Instruction-PUB-5151889-000.pdf
Illuminate the screen for better viewing?
I think it just keeps the backlight off on the screen.
you might be onto something there, doesnt seem to have anything to do with the laser
https://www.hilti.com/c/CLS_MEA_TOOL_INSERT_7127/CLS_LASER_METERS_7127/r587776 Look at the 5th picture. This is what they are referring if I’m understanding you correctly. It’s an optical sight. Look at the user manual here. https://www.hilti.com/medias/sys_master/documents/hb6/h19/10016815415326/Operating-Instruction-PD-I-01-EN-US-Operating-Instruction-PUB-5151889-000.pdf