The single-use BACtrack® SingleShot™ 0.02 %BAC breath alcohol tester is ideal for testing the presence of alcohol in zero-tolerance environments such as schools and businesses, as well as for family use. Simply squeeze the center of the tube to activate the test, and blow through the SingleShot. If the BAC is above 0.02%, the SingleShot’s indicator chemistry will indicate a positive result. It’s that easy. The SingleShot is 99% accurate, and perfect for on-the-go testing -- carry it anywhere, in your pocket, purse, or glove compartment.