If you are receiving an 'ERR' message on your Professional Fuel Cell Alcohol Breathalyser, this will be due to a reading error.
'ERR' will be displayed if the user doesn't blow for long enough, blows too hard, blows too softly or is interrupted.
Pressing 'OK' will restart the test.
The breathalyser will revert back to 'ALCO' mode once 'ERR' message flashes for 5 seconds.
You will need to steadily blow through the mouthpiece for about 5-7 seconds to get an accurate reading.
Once you start blowing, the breathalyser will beep continuously, ensure that you keep blowing until this long beep ends and another short beep occurs.