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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.
Class 2 Cold Lasers (Available over-the-counter) Since the development of class 1m laser, class 1 (without the m) and class 2 lasers are the weakest lasers on the market. In many cases, these lasers are about 1/500 the power level of a class 1m or class 3. This class of laser is slowly being phased out.