Which labelling requirements apply to lasers?

Each laser device must be permanently labelled per EN 60825-1 with the following information: laser class (e.g. „LASER CLASS 2“), wavelength in nm, maximum optical output in mW, standard caution statement (e.g. „Laser radiation – do not stare into beam“) and from Class 2 the laser warning symbol (yellow triangle with beam symbol). Class 3B and 4 additionally require: aperture marking at the beam exit, warning signs in the hazard area and a key switch where applicable. For laser systems built-in (e.g. machines with an integrated laser) the operator is responsible for labelling the complete installation.