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If you are interested in getting the highest level of accuracy in your readings, our recommendation is to spend the extra money on a Professional Series breathalyzer that uses Xtend® Fuel Cell Sensor technology. These breathalyzers offer the same advanced technology used by law enforcement for preliminary screenings for a fraction of what they have previously cost. Law enforcement, substance abuse centers, clinics, and businesses typically purchase these models, although they are often purchased for individual use, too.
If you are more concerned with alcohol detection, the presence of alcohol versus the precise measurement of %BAC, an Elite Series unit is likely appropriate for your needs. These models are often used for self-testing or testing friends and family. The quality of these breathalyzers is far above novelty grade breathalyzers and they are both affordable and accurate.