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http://www.breathalyzer.net/alcohawkabi.html
This Interweb thingee is awesome..........
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I own that one and it worked well for about a year and then gave out(all the readings are WAYYYYY low). I think I got it on ebay for like 75 so check that out.
I'm actually in the market for a new one now. Hmmm.
PS i owned one of those 30 dollar ones first and it was a pos. Stay away from those.
/edit just bought it for 85 shipped on ebay.
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Your old one will be just fine, you just have to send it in and get it calibrated. They suggest doing this every 6 months. Go to the company website and figure out where to send it.
I had one of the cheapies and it worked well for about 3 months. Now all it does is read out .40! However, it was a lot of fun while I had it.