PERSONAL BREATHALYZER HAVING DIGITAL CIRCUITRY

摘要

The present invention relates to a portable, personal breath tester device for testing the blood alcohol content of the user of the device. The breath tester comprises a circuit board, wherein a sensor, a liquid crystal display, and a processing unit are installed on and electrically connected to the circuit board. The processing unit receives a voltage signal from the sensor representing the blood alcohol content of the user and converts the voltage signal to a precise value that is displayed on the liquid crystal display.