Cheap digital breathalysers don’t work. A UK investigation into digital breathalysers being offered on e-bay and other auction sites for as little as £3.00 found that without exception the units either failed completely or gave wildly inaccurate readings.
The advice was clear. Do not buy from un-identified private traders. Ensure companies are offering full post sales support and look for expert knowledge in the field together with clear UK based contact details
Expect to pay £40.00 upwards for a serious digital breathalyser with service capability (all breathalysers will need regular servicing to maintain accuracy) Digital breathalysers below this and without service ability or changeable sensors must be viewed as consumable/disposable.