The directions are wackadoo - do not try and read them when drunk
I am not sure if this machine is accurate as I have no other machine to compare it to.  Drinking and driving is NOT an issue for me BUT I actually got this to use with others.  You know the friends that are mad bonkers drunk and are telling you they feel absolutely fine to go and drive home.  I can pull out this machine and have them blow to prove they are NOT able to drive home.  The machine is actually pretty light but slightly bulky to tote around unless you are already toting around a gigantic bag or backpack or something.  You could always just keep it handy at your own house when you have others over, though.  Again - it is pretty light regardless.<br /><br />To test it I took a slug of schnapps I had and tested it a few minutes later - and it said I was 0.  I didn't drink that much and waited a bit (as the instructions said) and I had not even a buzz - so maybe it was accurate.  One day when I am actually drinking and feel a buzz - that is the next time I will test this thing.  It is hard now during COVID as I am a social drinker and there is no more "social" right now. : (  I was also worried that the beeps from the machine would be loud and obtrusive but they are very low and not a problem at all.<br /><br />The only flaw I can see - without a true test right now - is that the directions are bonkers.  It is not really step by step but rather if's and if then's - but it is not written like that and is VERY confusing.  The directions seem to be much, much longer than what they need to be - seriously.  Definitely read the directions sober - if you are drunk these directions will make even less sense.
Rating: 4 stars