Breathalyzer
（重定向自Breathalyser）
![A law enforcement grade Breathalyzer, specifically an Alco-Sensor IV](/Images/godic/202501/01/Bafometro5848.JPG")
![An evidential breath tester](/Images/godic/202501/01/Evidential5848.JPG")
A breathalyzer or breathalyser (a portmanteau of breath and analyzer/analyser) is a device for estimating blood alcohol content (BAC) from a breath sample. Breathalyzer is the brand name for the instrument that tests the alcohol level developed by inventor Robert Frank Borkenstein. It was registered as a trademark on May 13, 1954, but many people use the term to refer to any generic device for estimating blood alcohol content .