Well, we don’t endorge or encourage cheating in exams, so use this tool at your own risk.
The ultraviolet pen lets you write something only you can see. Comes with ink made of special high-brightness compounds that are invisible to the naked eye, the hidden messages are revealed they are exposed to ultraviolet light, which is conveniently located on the opposite end of the pen.
Available at $7.50 each. (via Redferret)
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