You ask:
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Anyone know where to buy one?
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He answers:
[ QUOTE ]
http://www.breathalyzer.net/alcohawkabi.html
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You ask:
[ QUOTE ]
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 . . .