Having an accurate, portable, and easy-to-use breathalyser is a great way to empower yourself to make better drinking decisions. Just like wearing a watch makes me more concious of time and better at not being late, carrying a breathalyser makes me more concious of my level of consumption when I'm a few seconds away from checking my BAC. I carry one even if I'm not driving, and friends who want to make sure they are at 0 by the time they drive have peace of mind after an accurate reading. A must for any safe night-out and especially for any designated drivers to reduce any stress of uncertainty.