Sonic Screwdriver for Secret Messages

Remember the old standy, using lemon juice as ink in order to scribble down a secret message? 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 message 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.