Can we use the laser pointer safely?

Visible laser pointers with a power of 1-5 MW are classified as Class 3a and may be dangerous even if viewed for a short period of time. The user should not look directly at the laser beam of a Class 3a laser pointer. According to the regulations of the Food and Drug Administration (FDA), such laser pointers must be marked with the word "Danger". Laser pointers are divided into several categories, which represent the output power of a specific unit. However, if you want to buy a combustion laser, it is very important to understand what the different green laser pointer categories and powers mean to you (the end user). Let's take a look at the power level required for handheld laser burning, what you can burn, and whether color is important. The study of astronomy. Powerful green light-a great way to specify the stars you want. On a moonless night, the pointer is clearly visible in the starry sky. This is why many amateur astronomers use rays to demonstrate or describe celestial bodies. In addition, laser beams are used for telescope alignment.