A more thorough explanation:

An intoximeter is a device used to measure the amount of alcohol in a person's breath. It is often used by police officers to determine if someone has been driving while intoxicated.

For example, if a police officer pulls over a driver who they suspect has been drinking, they may ask the driver to blow into an intoximeter. The device will then measure the amount of alcohol in the driver's breath and give a reading.

Intoximeters are also known as breathalyzers, alcoholometers, drunkometers, and intoxilyzers. If the test is properly administered, the results of an intoximeter test can be used as evidence in court.