Q. How should I use my portable breathalyzer?
u003cstrongu003eA:u003c/strongu003e Check your user manual before attempting to use a breathalyzer. For best results, wait 20 minutes after drinking or eating anything before you test your BAC. Avoid using alcohol-based mouthwashes or testing in high winds or enclosed spaces. Blowing smoke into the mouthpiece will damage the sensors.