Think it's important to remember that you need to wait a period of time before using the breathalyzer after your last sip, otherwise it over reports your level.
I'm very careful about keeping track of what I have had to drink to make sure that I am not at risk for a DUI. I decided to invest in this device as an added layer of protection - to make sure my mental math is correct. It is easy to use and appears to be quite accurate.
The BACtrack is exactly what I hoped it would be. Easy to use, relatively inexpensive, and so far totally reliable. I'd recommend this device to anyone who has an interest in monitoring BAC.