Why Is There A Difference Between ''safe'' And ''unsafe'' Laser Rangefinders?

As the name suggests, a laser rangefinder is a measurement tool that uses laser as a carrier wave to achieve the distance measurement function. Currently, 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 are accidentally exposed to the laser with a wavelength of 1064 nanometers, the damage to the eyes may be permanent. Therefore, in foreign countries, 1064-nanometer lasers have been completely banned in handheld laser rangefinders. In China, some manufacturers also produce 1064nm laser rangefinders.
For 905 nanometer and 1540 nanometer laser rangefinders, we call them "safe". For the 1064 nm laser rangefinder, we call it "unsafe" because it is potentially harmful to the human body.
The laser rangefinder uses laser for distance measurement, and the pulse laser beam is a monochromatic light source with very concentrated energy. Therefore, when using it, do not look directly at the emission port, and do not use an aiming telescope to observe the smooth reflective surface to avoid Harm people's eyes. Be sure to perform measurements according to the safe operating 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.