Mouthpiece 10 Pack

Does not fit quite right but does work

I've had the Watchdog Breathalyzer for about 6 months, and it seems to work great. I can't determine its accuracy, because I have nothing with which to compare it; however, its readings are highly reproducible, and make sense. The readings are also consistent with my feelings of inebriation. We take it with us whenever we're going to an event that will surely be serving alcohol. After you hold the on/off button in for a few seconds, it turns on, and there is a countdown while the device prepares itself. At each step, the screen displays an instruction on what to do next. It tells you when to start blowing, and a change in sound accompanied by a click tells you when to stop blowing. You then wait a few seconds for the result to appear on the screen, flashing red when the reading is excessive (I haven't figured out at what percentage alcohol the display flashes red; but, it could be in the written instructions.) In any case, when I'm semi-plastered, it flashes red. I purchased extra plastic mouthpieces. I also wash them to reuse them, and keep them in a small, plastic baggy.