... good surface quality 4. the competitive price 5. good reputation ir pass filter1.Material: Black Optical Glass (HWB760, HWB780, HWB800 ... :±0.01mm±0.02mmThe ir pass filter can be used in infrared gas analyzer, infrared cameras, night vision products, ... , infrared receiver, infrared light, infrared sensor products, security cameras infrared night vision surveillance, such as police, military and other ...