Remember the old standy, using lemon juice as ink in order to scribble down a secret report? Well, the Sonic Screwdriver allows you to relive those third grade memories of leaving secret messages for your friends minus the hassle of lemon-based invisible ink, since it holds an ultraviolet pen instead, where the report can be read only with a special

UV light. Guess you will need at least a couple of these in order to use it effectively. The Sonic Screwdriver will retail for £9.99 and comes with sound effects, a spare standard ink nib and wipe.

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Original post by Top Tech News