Breathalyzer Ontario What Does The "A" Stand For On A Breathalyzer Test ?

What does the "A" stand for on a breathalyzer test ? - breathalyzer ontario

I did not take an alcohol tester (like) and an 'A'. apparently that means I'm not above the legal limit, but I'm posting a warning. can someone explain what this means. I only had 3 beers. I am from Ontario, Canada, when it arrives. Thank you a bunch!