A more thorough explanation:

An alcoholometer, also known as a breathalyzer, is a device used to measure the amount of alcohol in a person's breath. It is commonly used by police officers to determine if a person is driving under the influence of alcohol.

For example, if a police officer pulls over a driver who is swerving on the road, they may ask the driver to take a breathalyzer test. The device will measure the amount of alcohol in the driver's breath, and if it is above the legal limit, the driver may be charged with a DUI.

Breathalyzer test results are admissible as evidence in court if the test was properly administered. This means that if the police officer followed the correct procedures when administering the test, the results can be used as evidence in a trial.

Other terms for an alcoholometer include drunkometer, intoxilyzer, and intoximeter. These terms all refer to the same device used to measure a person's blood alcohol content.