Involvement:Expert (understands the inner workings) - Ownership:1 day to 1 week
Provides consistent readings, repeatable. Very easy to use, keep it in your car
Battery door prone to fall off.
If you use it when you have not drinked at all (zero %) the tester sometimes behaves strangely: countdown from 190 in place of 150, and no "blow' indication. However, as soon as you blow with alcohol in your breath, it quickly goes back to normal.
Good price / quality product, with consistent result, should be compared with an official tester for precision assessment. Sometimes a strange behaviour, but without consequences.
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