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Title: Not as accurate as I would have liked
Review: Upon receiving this product my wife and I had a little test session and found this to be rather unreliable. While it is cheap and really convenient and small, we would get very different readings on subsequent breaths using the recommended techniques (trying to capture the end of our breaths and not blowing very hard) and, more often than not, in the wrong direction. After we both drank 4 shots and waited a half-an-hour (purely for research sake. . .) only once out of several tries did it correctly tell us that we were over the legal limit - often telling us that we were far under (the majority of the results ranged from .02 to .06). I would suggest going with something a little more accurate and likely more expensive if you are rely on the device.
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