Useful and accurate.
I compared the BACtrack Mobile Breathalyzer  with the newer Ace Breathalyzer and with the caveat, despite BACtrack’s recommendation the breathalyzer should be recalibrated every year which I have never done (I haven’t used it that often), the differences in results experienced between the two were insignificant for every reading, for three test subjects.<br /><br />Each employs a high qualify fuel cell sensor and in each instance, the difference in readings never exceeded 0.001%.  It should be noted it is also recommended recalibration be performed annually on the ACE as well. The ACE uses 2 AAA batteries vs the other device’s USB rechargeable lithium ion battery.<br /><br />While the BACtrack is more convenient to carry based on size, it also requires Bluetooth 4.0 connectivity to an iOS or Android device whereas the ACE is completely self-contained. I felt the ACE device with its’ protective yet bulky case is bit clunky to carry in one’s pocket but much less of a trial to use. Most of the additional features available via the BACtrack app – excluding the ability to estimate when BAC levels will return to 0.00% - are inconsequential to me and in my opinion, potentially intrusive. I don’t have any desire to store historical information in a cloud.<br /><br /> Each employs a high qualify fuel cell sensor and as noted, I didn’t find any variance in reading of blood alcohol content – as long as the guidelines for testing for each device were accurately followed.  In that context, the ACE unit warms up faster and doesn’t require the user to participate in a pulmonary capacity test to get an accurate reading (a moderate strength blow of about four seconds is all that is required).
Rating: 4 stars