Infrared Narrow Banpass Optical Filters(NIR): Application:CCTV camera,video doorbell,surveillance camera,digital telescope,IR receiver,telemetry controls,laser rangerfinder,laser speed measurement,biological detection,projector,Fingerprint Identification System,Human Face Identification System Substrate:B270,Sola-lime Dimension: Round Type:φ3.0mm~φ100mm Squarte Type:3.0mm~80mm Thickness:0.3mm~2. ...