Professional Breathalyzer Testerwith LCD Screen and Semiconductor Sensors - Accurate Alcohol Tester with 12 Mouthpieces for Personal and Professional Use, Ideal for Police and Alcohol Testing.

Take the test 20 minutes after drinking; press and hold the switch to turn on the tester, wait for the 10-second countdown to warm up, and start blowing after the second countdown; when the blowing is completed, the test results are displayed. There is a certain discrepancy between the data and the actual test results. The reason is that the human body has different abilities to absorb and decompose alcohol.