This machine is placed in bars to test the alcohol level of patrons. It is mainly used for entertainment purposes, but will inform people of their blood alcohol level. The only cost is buying straws. They patron must blow into the straw and into the machine to get a reading. It is not used to make people stop drinking once thay have taken the test, but knowing is better than leaving out of the bar and getting a DUI because your beyond the limit. It hangs on the wall and you can charge a customer anywhere between $1-$4. You may also change the language setting. It's perfect if you want to start a small business or make extra money on the side. Depending on the bar and volume of customers (preferably a college bar) you can make over a $2000 a month
