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You ask:

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Anyone know where to buy one?

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He answers:

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http://www.breathalyzer.net/alcohawkabi.html

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You ask:

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If you have one, anything I should know?

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He doesn't answer. Presumably because he doesn't have one. So he answered 1 out of 2 of your questions. That's how he was helpful. If you only wanted responses from people who have experience with these perhaps you should have said so.

If this were my forum . . .

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Maybe I'm just grumpy from being up all night, but it looks like he typed breathalyzer into google and linked the first page. That's not helpful b/c, as I hope anyone else would do before posting a question like this, I googled the product before asking for input.