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Great to use, especially if you're about to get in a car. I was a little scared at first to break the capsule, but you just squeeze until you see the glass inside break! Shake it, blow for 12 seconds, and wait a minute. If the yellow grains inside turn blue/green then you know you're over the limit. I used the 0.08% tester so that's the legal limit here in California.
Rating:  [5 of 5 Stars!] |
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