Why is there a difference between the so-called "safe" and "unsafe" laser rangefinders?
As the name suggests, a laser rangefinder is a measurement tool that uses lasers as a carrier to achieve the ranging function. At present, the lasers used in the hand-held laser rangefinders on the market mainly include the following: semiconductor lasers with working wavelengths of 905 nm and 1540 nm, and YAG lasers with working wavelengths of 1064 nm. The wavelength of 1064 nanometers is harmful to human skin and eyes, especially if the eyes are accidentally exposed to the laser of 1064 nanometers, the damage to the eyes may be permanent. Therefore, in foreign countries, the 1064-nanometer laser is completely banned in the handheld laser rangefinder. In China, some manufacturers also produce 1064-nanometer laser rangefinders.
For the 905nm and 1540nm laser rangefinders, we call them "safe". For the 1064 nm laser rangefinder, we call it "unsafe" because of its potential harm to the human body.
Laser rangefinder, because laser is used for distance measurement, and pulsed laser beam is a monochromatic light source with very concentrated energy, so when using it, do not look directly at the emission port with your eyes, and do not use an aiming telescope to observe the smooth reflective surface to avoid Injure people's eyes. Be sure to measure according to the safe operation specifications in the instrument manual. When measuring in the field, do not point the transmitter port of the instrument directly at the sun to avoid burning out the photosensitive element of the instrument.
