Alcohawk
With New Year's Eve just around the corner, don't drive after a lot of drinking without first using the Alcohawk Digital Breath Screener ($70-$150). This professional breath analyzer has you blow into the mouthpiece and, in a few seconds, an estimate of your blood alcohol content appears on the LCD. If your level is too high, just keep 'em coming and give the keys to a buddy or stay the night.