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Below is a table showing the meaning of the different Classes of Lasers and LEDs according to the current version of EN 60825-1 and IEC 60825-1. A more detailed description is available by going to An Overview of the Laser Classification System.
|Class 1M||Safe provided optical instruments are not used.|
|Class 2||Visible lasers. Safe for accidental exposure (< 0.25 s).|
|Class 2M||Visible lasers. Safe for accidental exposure (< 0.25 s) providing optical instruments* are not used.|
|Class 3R||Not safe. Low risk.|
|Class 3B||Hazardous. Viewing of diffuse reflection** is safe.|
|Class 4||Hazardous. Viewing of diffuse reflection is also hazardous. Fire risk.|
*Optical instruments - binoculars, telescopes, microscopes, magnifying glasses (but not prescription glasses).
**Diffuse reflection - the reflection of radiation from a matt surface such as a wall.