It detects alcohol but not accurately

Since this LOOKS like the more expensive, official police breathalyzers I thought it might work like one (and for $10 I didn't really care). Problem is, there's no accuracy. After having ONE drink, it registers at 0.16 (TWICE the legal limit). After having SIX drinks, it STILL gives 0.16. The only other reading I can get out of it is 0.00 when I've had no drinks. So basically it'll only read 0.00 or way over the limit. Not really useful, but that's why it's cheap.

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