Below are basic operation guidelines for the BACtrack S70 Breathalyzer. For more detailed instructions and explanations, please read the BACtrack S70 Breathalyzer Owner’s Manual.


IMPORTANT: Users must wait 20 minutes after eating, drinking, or smoking before blowing into the S70 Breathalyzer. Failure to wait 20 minutes can provide inaccurate test results and may damage the sensor.

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

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 Start button for 30 seconds will trigger it to automatically shut itself off with minimal effect on the life of the battery.

Error Notifications

Advanced Menu Options

To adjust the Advanced Menu Options you must press and hold the Mode button for five seconds while the unit is performing its initial countdown. This is the only time you can enter this menu. Once you do so, you can cycle through the menu options below by tapping the Mode button.