The Breathalyzer

Some of you may be familiar with this for reasons irrelevant to nursing. This is used at my work to, of course, test alcohol levels in the blood using a patient's breath. First, you need to turn the device on. Hold the power button until the numbers appear. Then have the patient blow out into the plastic piece until the device beeps. It will then give you a percentage you need to document. The plastic piece is disposable, so dont reuse!
Here is a link that shows a demonstration on using a breathalyzer.

http://www.youtube.com/watch?v=zOwI5GtN4fk

This is a picture of the breathalyzer we use at my work. Different from the above video, but very similar.