What was the first successful breath test device and what did it measure to determine blood-alcohol concentration? What is the main difference between this device and the breath test device currently in use?

BREATHALYZER

It measured alcohol content of alveolar breath

The difference between this device and the breath devises currently in use that THE MODERN TEST ARE FREE OF CHEMICALS.

Explanation:

answer; can each be concretely realized in different ways;

answer; media advocacy;