Breathalyzer Mouthpieces 10 Pack Professional Ketone Breath Alcohol Tester Mouthpieces for Breath Alcohol Breathalyzer Detector

no one should be without this. if you are just using it for yourself you Don't need to work about the replacement mouth pieces. It seems to very accurate and my husband and I do not go out without it. If u are someone who is consciencious about body weight/# of drinks/time else I think you will find it comforting to have your calculations confirmed. We can often guess our % within a tenth of degree.

This is not good