While sitting at a bar, have you ever wondered if you've had too much to drink to drive safely? Do you know what the legal limit for blood alcohol concentration is? What does that number mean anyway? Would you be able to tell the difference between a .07 and a .08? That's the difference between being legal and being at risk for a DUI.

Many people, particularly those who consume alcohol regularly, build up a tolerance for alcohol and can still function normally in many day-to-day activities - even driving. But if you drink enough alcohol and drive home, you put yourself at risk for a DUI, which can cost many thousands of dollars in fines, increased inurance fees, legal bills and lost time from work.

Wouldn't it be prudent to check yourself before the men in blue do? Personal breathalyzers are inexpensive and highly accurate tools for alcohol breath testing and are small enough to be carried in a pocket, purse or in your car's glove compartment.