BACtrack C8 review of a fuel cell tester with an optional app

The C8 suits an adult who wants to understand how their own drinking affects their numbers over time. The app saves each result, and its ZeroLine feature estimates when BAC returns to 0.00%, which makes patterns easier to see than a notebook would. Because the device also shows its reading directly, it still works when the phone is flat or left at home.

It is less of a match for a group that shares one tester many times a week. A single AAA battery rated for about 250 tests means more frequent changes than the larger Pro Grade units, and the absence of a published tolerance makes it harder to judge how close two readings need to be before you treat them as different.

The upper end of the range is listed as 0.400% BAC in the older brochure and 0.300% BAC on today's product page. Either way, the limit is far above the levels a personal user would screen for, but the change suggests the maker revised its claims, so treat the current page as the one to check.

The brochure describes the intended use as screening for the presence of ethanol in human breath and calls the C8 a personal breathalyzer, while the current page title mentions personal and professional use. We found no C8 specific DOT, NHTSA or FDA 510(k) statement on the maker's pages.

The ZeroLine figure is a calculation from your reading, not a fresh measurement. Treat it as a rough guide to timing, never as clearance to drive. Our bac calculator over time explains how such estimates are built and why they vary between people.

The product page states that every BACtrack breathalyzer needs periodic recalibration, though it gives no interval specific to the C8. The brand's general advice is to calibrate at least once every 12 months and more often with heavy daily use. The C8 is listed on the maker's send in calibration service, which includes mechanical, air flow and accuracy checks with a standard turnaround of about 10 to 14 business days after the unit arrives.

Unlike the S80 and Trace, the C8 is not part of the Pro Grade group that the maker says holds calibration longer. Plan for at least a yearly service and keep spare C-Series mouthpieces on hand, which our breathalyzer mouthpieces page lists by family.

The closest sibling is the BACtrack C6, which shares the BluFire sensor and app modes in a keychain body with a shorter published range. If you want a numeric tolerance and longer battery life, the BACtrack S80 is the step up. For app based testers from other makers, browse our smartphone breathalyzer category, and if you are weighing sensor types, the fuel cell vs semiconductor breathalyzer comparison explains the difference.