How to judge the safety level of laser products?

The safety level of laser products is mainly determined by factors such as the laser's output power, wavelength, operating environment, and exposure time. 

First, output power is one of the key indicators. For example, output power below 5mW is generally considered to be a level with lower safety risks. 

Wavelength also affects the determination of safety levels. Lasers of different wavelengths have different penetration and damage to human tissue. 

The operating environment is also important. If the laser is used in an open space, the risk is relatively low; but if it is used in a small, closed and crowded environment, even a low-power laser may bring a higher risk. 

Exposure time is also critical. Long-term exposure may increase the possibility of injury.