French NF Legal Requirement Approved Breathalyser (Twin Pack)
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These are the correct NF approved breathalysers, so meet the legal requirement, other cheaper versions on the market may not be NF approved which will mean they will not cover you for driving in France. You can't tell when the alcohol's cleared in your system, but the AlsoSense Singles can - shows your alcohol level in 2 minutes - when you pass the red line you are over the French drink drive limit.