This product in the optical index is a 650nm bandpass filter, because it was at 650 ± 25nm by the band, this band of light is red, so you can also say that this product is red piece. This is actually a 650nm narrow bandpass filter bandpass filter, in order to meet the majority of users called hobby renamed. The majority of users, especially laser measurements, stray light rangefinder user requirements are not too high, as long as the light can filter out 85% is enough, so this is suitable for a semiconductor laser, is not involved in imaging instruments and equipment and customization a. Can also be glued or applied as a special purpose anodized aluminum sleeve according to specific customer needs. Geng Xu photoelectric bandpass type color film multilayer subdural by ion assisted deposition of nanomaterials high vacuum evaporation is made, the film density is good, high-resolution imaging. Application: fluorescence analyzer, microplate reader, cable upgrade equipment, wireless transmission equipment, mobile barcode scanning, infrared whiteboard, infrared cameras, infrared touch screen, iris recognition, infrared medical instruments, infrared ink recognition, red film recognition, face recognition sensor systems, handheld infrared laser rangefinder laser range finder, red laser measuring instrument container, barcode scanners, laser measuring instrument, red LD pumped laser, red laser diode, IR rangefinder, fingerprint identification device . Product Specifications: As the band: 400nm-610nm, 700nm-1100nm Up depth: T92% Specifications: 4 * 4 * 1.0mm 5 * 5 * 1.0mm 6 * 6 * 1.0mm 10 * 10 * 1.0mm