Why is there a difference between "safe" and "unsafe" in laser rangefinders?
As the name suggests, a laser rangefinder is a measuring tool that uses laser as a carrier to achieve distance measurement function. At present, the handheld laser rangefinders on the market mainly use the following types of lasers: semiconductor lasers with operating wavelengths of 905 nanometers and 1540 nanometers, and YAG lasers with operating wavelengths of 1064 nanometers. The wavelength of 1064 nanometers is harmful to human skin and eyes, especially if the eyes accidentally come into contact with 1064 nanometers of laser, the damage to the eyes may be permanent. So, in foreign countries, the 1064 nanometer laser has been completely banned from handheld laser rangefinders. In China, some manufacturers also produce 1064 nanometer laser rangefinders.
For laser rangefinders at 905 nanometers and 1540 nanometers, we call them "safe". For a 1064 nanometer laser rangefinder, it is called "unsafe" due to its potential harm to the human body.
Laser rangefinder, due to the use of laser for distance measurement, and the pulse laser beam is a monochromatic light source with very concentrated energy, do not aim your eyes at the emission port directly when using it, nor use a aiming telescope to observe the smooth reflection surface, in order to avoid hurting people's eyes. Be sure to measure according to the safety operation specifications in the instrument manual. When conducting field measurements, do not directly aim the instrument's emission port at the sun to avoid burning out the instrument's photosensitive components.
