A device that measures alcohol in expired air so as to estimate the concentration of alcohol in a person's blood; used by traffic police in cases of suspected driving while over the limit
a device that measures alcohol in expired air so as to estimate the concentration of alcohol in a persons blood; used by traffic police in cases of suspected driving while over the limit
a device that measures chemicals (especially the alcohol content) in a person's expired breath
{i} device used by police to test a motorist's breath for alcohol and determine if he/she is intoxicated (also breathalyser)