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The heart of this test has to be how accurate the readings are. With the help of AlcoSense, we tested each device five times at the UK (excluding Scotland) (0.35 mg/l), Scottish (0.22mg/l) and Irish professional and new driver (0.09mg/l) limits. To find out we sourced six machines to see if the budget semi-conductor devices can match up to the more expensive and accurate fuel-cell units. How we tested them We also measured how much air was needed to get a result, as required by EN 16280 for breathalysers. This is included because alcohol concentration is most accurate in deep-lung air. Air from the throat could give a false reading.
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