a device that displays on a fluorescent screen reflected infrared radiation, enabling the user to see objects obscured by darkness.
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British Dictionary definitions for snooperscope
military, US an instrument that enables the user to see objects in the dark by illuminating the object with infrared radiation and converting the reflected radiation to a visual image
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012