Jansen-Brand Micro-Macro Spectroscopes - (Official Spectroscopes of the Purple Brotherhood)
Another one of Jan Jansen's inventions, these glasses allow Jan to detect invisibility once per day. They also give Jan an additional +25% to his detect and disarm traps abilities. Various lenses on the contraption increase Jan's ability to detect illusions by 20%. The style of the Spectroscopes is so obvious it hardly needs to be mentioned.