According to Alcosense, its Pro model breathalyser brings “near police accuracy into the reach of the consumer”, thanks to its 121mm² fuel cell sensor, that’s an identical design to its 200mm² big brother used in several UK, US and European police breathalysers. It also uses a sampling system that ensures only deep lung air is measured, for more accurate results, taking a reading when one litre of air has been exhaled. Software shows in real-time if you are blowing correctly, and you can change to any location in the world to adjust the limit for local legislation. Results are colour coordinated green for a low result, amber for up to 80 per cent of the legal limit and red for “close to or over the limit”.