The Spectrex 20/20-313 is a long range Simulator that is designed for use with SharpEye Optical Hydrogen Flame Detectors. The Spectrex 20/20-313 emits electromagnetic radiation in an unique pattern which corresponds and is recognized by the SharpEye Hydrogen Flame Detectors as fire. This allows the SharpEye Optical Hydrogen Flame Detectors to be tested under real fire conditions, without the risk of a real flame.