Breathalyzer coaching and setup methodology

A breathalyzer coaching methodology for coaching a user of a breathalyzer to make use of correct blowing technique, the method comprising:

• gathering a sample breath provided by a user;
• determining the instantaneous volume V, flowrate F and pressure P of the sample breath as it is being provided by the user;
• determining whether the determined sample breath instantaneous volume V is less than a minimum threshold breath sample volume V1;
• determining whether the determined sample breath instantaneous flowrate F is greater than a maximum threshold breath sample flowrate FMAX, between a maximum threshold breath sample flowrate and a minimum threshold breath sample flowrate FMIN, or less than the minimum sample breath flowrate FMIN;
• determining whether the determined sample breath instantaneous pressure P is greater than a maximum threshold breath sample pressure PMAX, between a maximum threshold breath sample pressure and a minimum threshold breath sample pressure PMIN, or less than the minimum sample breath pressure PMIN;
• and
• forming a diagnosis of any problems with the user's blowing technique based on said detected instantaneous volume V, flowrate F or pressure P values and providing at least a corrective coaching message to the user depending upon said diagnosis, wherein if the instantaneous flowrate F status is greater than FMAX, then the method is stopped and a correcting coaching message communicating that the instantaneous flowrate F status is greater than FMAX is displayed to the user.