Package Includes -- The package includes 10 sheets of double-sided black laser test paper measuring 280x 210mm/11x8.3 inches with a thickness of 0.2mm.Product Features -- The laser engraved test paper is black and can be used on both sides. The laser-printed area on the paper is white, with clear edges of the light spot, which makes it easy to show the color for easy identification.Product Function -- Laser performance debugging, spot quality debugging, adjusting machine parameters, galvanometer correction and marking laser engraving sample testing, etc., can also be used for other light source performance debugging.Applicable Range -- Laser dimming paper is widely used in semiconductor laser marking machine, fiber laser marking machine, UV laser marking machine, CCD visual positioning dynamic focusing, CO2 laser marking machine, YAG laser welding machine, laser punching machine, SL A laser 3D printer, laser beauty spot removing apparatus, etc.Warm tips -- Double-sided black engraving test paper can only show traces when using equipment with a power of 2W or more. When using equipment with higher power, the power should be gradually increased until the appropriate effect appears, so as to avoid too much power to break through the laser test focus paper.