Having a blast at parties often mean unrestrained behaviour when it comes to drinking, which is why this Alcohol Breath and UV Warning Tester is an essential companion every time you hit the bar with your mates. Not only does it tell you whether you’re fit enough to drive, it also lets you know whether its safe enough to spend some time under the sun with the UV detector. Being shaped after a pen, I don’t see why the manufacturers can’t just stick in a tube of ink and add some writing functionality into the mix as well. A red light denotes you’re too drunk to drive, while green means you haven’t touched your drink. Come on, everyone knows you don’t just stop at one! The Alcohol Breath and UV Warning Tester retails for £16.95 and works only with the U.K. alcohol limit.