Breathalyzer Microphone

Step 23 Taking a reading

To take a reading, approach your subject and turn the microphone on at least one minute before having them speak into it. About thirty seconds into the reading turn the microphone off to take a string of "zero" readings. This is important because it is the initial reading taken within the first thirty seconds that you need to clearly delineate.

Once you turn the microphone back on, it probably will no longer be completely accurate and need some time to reset.