A Class 3R laser is considered safe if handled carefully, with restricted beam viewing. With a class 3R laser, the MPE can be exceeded, but with a low risk of injury. Visible continuous lasers in Class 3R are limited to 5 mW. For other wavelengths and for pulsed lasers, other limits apply.

According to the revised ANSI Z136.1 Safe Use of Lasers, laser area warning signs should be posted around Class 3 laser areas and is required to be posted around all Class 3B and 4 laser areas. Additionally, NOTICE signs are required for Class 3B and Class 4 lasers during maintenance, servicing, and similar situations.

LIA has a laser area warning sign for any type of laser. LIA signs are 10" x 14" in size are are available in plastic material. All signs meet the ANSI Z136.1 requirement for laser safety and can be customized with your laser's specifications and warning statements for only $5.00 per sign.