Below are basic operation guidelines for the BACtrack S50 breathalyzer. For more detailed instructions and explanations, please read the BACtrack S50 Breathalyzer Owner’s Manual.


IMPORTANT: Users must wait 20 minutes after eating, drinking, or smoking before blowing into the S50 breathalyzer. Failure to wait 20 minutes can provide inaccurate test results and possibly damage the sensor.

The displayed result is an estimate of the test subject’s BAC.

The test result will be displayed for 10 seconds. Then the S50 will beep five times before powering off. If the BAC reading is over 0.05%, the red WARN lamp will illuminate and a rapid beep alarm will sound.
A breath alcohol tester cannot determine the exact BAC in the blood of the test subject. Correlation between Breath Alcohol Content and Blood Alcohol Content depends on many factors, such as temperature and health conditions. Therefore, only use this device as a tool to screen for the presence of alcohol.
Many people consider a 0.02% or greater a positive test for alcohol in “zero tolerance” screening. Most states have 0.08% as the legal BAC limit for tasks such as operating a motor vehicle. Some states prohibit driving commercial vehicles or any vessel with a 0.04% BAC or higher. Many states and countries prosecute individuals for driving under the influence at any level.

Powering Off

To turn the power off at any time, leave the unit alone. Not touching the power button for 30 seconds will trigger it to automatically shut itself off with minimal effect on the life of the battery.