''Those cheap gizmos are known to give inaccurate readings''
I agree entirely, that there are some cheap gizmos on the market not worth buying, but I am talking about a serious breathalyser employing a Police grade sensor or actually a Police issue breathalyser. Not too many decent suppliers out there but a lot selling rubbish. Had a mate recommend another outfit who also supply Police products:
Breathalyser Store - Breathalyser, Breath Tester, Breathalysers, Breathalyzer, Alcohol Testing.