These products are good guide lines, but you have to calibrate every six months. Several things plays a factor weight, food, and last drink that is why a officer asked when is your last drink. Always be honest, there are troopers that are highly trained they ask how many don't lie, I know everyone says a couple then they change there mind. If you can't keep up with 6 beers then you don't need to drink. 12 ox beer, one ounce 100proof liquor, 4 oz. Wine same results. Drink responsibility GOHS always buckle up and don't text and drive