Red monochrome eyeglasses are designed to work with laser levelers in visual mode at reduced visibility conditions.
There is often a situation where the projection of a laser beam in a room with increased lighting becomes poorly visible. Then use these glasses.
The monochromatic red filter will pass through the red laser beam, while the rest of the spectrum will be held. Thus, the visibility of the laser beam projection will improve from 1.5 to 2 times.