This device is extremely unreliable. I drank two beers, waited the required 20 minutes, then blew. I got a .00 four times in a row. Then I tried it again and got a .04. Other times, I blew a .07, then tried it a minutes later and got a .00. The fact that you have to wait 20 minutes to use it after eating or drinking) makes it somewhat impractical.
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