OBEST® Professional Police Digital Breath Alcohol Tester Portable Breathalyzer Keychain Analyzer Alcoholic Dectector LED Backlight (style1) (black)

OBEST® Professional Police Digital Breath Alcohol Tester Portable Breathalyzer Keychain Analyzer Alcoholic Dectector LED Backlight (style1) (black)
I got this Breathalyzer Keychain for a friend of mine. He uses it to pre-test prior to blowing in his breathalyzer in his car. Since purchasing this, he has not had any violations. It has been very accurate. This is keychain model is definitely a great value for its purpose.