The AlcoSense Precision is a state of the art instrument used to detect Ethyl Alcohol from a valid breath sample. The  AlcoSense Precision  uses an electrochemical fuel cell  to measure the concentration of alcohol from the exhaled human breath. It also has passed the AUSTRALIAN STANDARD testing AS 3547 Type 2 Device.  High Acuracy 4 digit platinum electrochemical fuel cell sensor digital breathalyser with advanced SONIX micro controller technology. If alcohol is present, a corresponding voltage is generated from the fuel cell, which is proportional to the alcohol content of the sample provided by a human subject. This voltage is then sent to the Micro controller to calculate and display a subjects %BAC