The laser alignment filter Type T81 is a green absorbing mineral glass filter without additional coating. The protection is based on absorption of the laser light within the bulk material. The filter Type T81 has a daylight transmission of approx. 35% and a good colour recognition. The laser alignment filter is available in two different frame styles and suitable for alignment purposes of laser beams between 630 and 690nm wavelength. Please calculate required protection levels before using laser safety filters and compare with the filter provided.