Fortunately, not all laser pointer are dangerous. Unfortunately, it is not always easy to tell which ones are safe. Although the US Food and Drug Administration (US Food and Drug Administration) regulations require that most laser products must bear appropriate warning labels, sometimes this information is missing or insufficient.About 150 mWh, the laser beam can be felt on the skin according to the focus of the beam, skin color (absorption), etc. At about 500 mWh, if the laser beam starts to burn the skin, the person is within a few meters of the beam.
By the way, even a powerful industrial laser machine will not cause deep burns, limb injuries, gunshot wounds or other effects seen in science fiction movies. Although multi-watt laser beams are definitely a serious eye hazard, they cannot effectively cause physical injury.
In order to determine whether your blue laser engraver is safe, htpow recommends the following guidelines:
Check the battery. The button battery means that the output of the laser pointer may be less than 5 milliwatts. AA, AAA and lithium batteries mean that the output of the laser pointer may be 5 milliwatts or higher.
Laser pointers sold with battery chargers usually have an output greater than 5 milliwatts.
If your laser has a removable cover that can spread the beam into a certain pattern, the output of the blue laser pointer may exceed 5 mW if the cover is removed.
When viewing marketing materials, please pay attention to the following keywords: powerful, bright, super, super, military grade, powerful, blasting, burning, burning, adjustable focus, lithium battery and lithium power.Eye injuries caused by lasers are usually not injured. Therefore, it is better than regretting, to be safe and not to let all laser pointers close to the eyes.
For direct eye injury, the exact severity will depend on many factors: beam power, exposure time, relative movement of the beam/eye, distance from the laser, location of the retinal injury, and the person’s physical/genetic susceptibility to eye injury (some People are more sensitive than others).