You know you should never drive after drinking. And with the BACtrack Trace Pro Breathalyzer, you can be sure you’re always under the safe limit. This personal breathalyzer gives you an accurate reading in just seconds, so you know when to call a cab. Weighing just three ounces, this is the type of gadget that’s easy to carry with you even in a clutch. So there’s no excuse not to bring it if you’re going out. Using the company’s Xtend Fuell Cell Sensor Technology, the Trace Professional is easy for anyone to use. Moreover, the device comes with six mouthpieces, so you’ll have enough for your friends to test themselves. It requires just two AAA batteries, and it actually lasts for a full 1,500 tests before you need to replace them.