Micro-Processor based Breath Alcohol Analyser is extensively used for the person who has consumed alcohol to measure blood alcohol content. The Alcohol Analyser is a microprocessor based hand-held instrument and detects breath alcohol level between 0 to 500 mg/ 100ml of blood or 0.000 to 0.500 BAC. The Alcohol Analyser is designed with on-board memory which stores up to 3000 test results along with time and date. Micro-Processor based Breath Alcohol Analyser is designed with computer and printer interface.