The BACtrack Mobile Breathalyzer is a pretty cool gadget. It pairs with your smartphone and using the app that they have, you can go ahead and see what your blood alcohol level is. It's a pretty popular product actually. The device also estimates when your blood alcohol level will return to 0.0%. This is typically about $200, and right now it's on the AH Deals store for just $84.99, making this a pretty incredible deal.
You can pick up the BACtrack Mobile Smartphone Breathalyzer now for just $84.99.