The 6 Best Keychain Breathalyzers

Updated March 06, 2017 by Steven John

6 Best Keychain Breathalyzers
Best High-End
Best Mid-Range
Best Inexpensive
We spent 25 hours on research, videography, and editing, to review the top selections for this wiki. Driving under the influence of any intoxicant is never a good idea. While the compact keychain breathalyzers on this list should definitely not be relied upon to guarantee you are sober enough to get behind the wheel, they can provide an indication that it's probably wise to open up that app and order an Uber or Lyft to get home. When users buy our independently chosen editorial picks, we may earn commissions to support our work. Skip to the best keychain breathalyzer on Amazon.

6. Keychain Alcohol Tester

The Keychain Alcohol Tester may use an advanced semiconductor oxide alcohol sensor to detect booze in breath, but it displays the results in a decidedly basic way: a green light means you're alcohol-free, a yellow light indicates a bit of booze breath, and red means drunk.
  • built-in flashlight
  • very low price tag
  • results far from specific
Brand Generic
Model pending
Weight 0.3 ounces
Rating 4.1 / 5.0

5. TruBreez FIT

The TruBreez FIT is a rather low-cost yet relatively accurate BAC testing unit, and it is so simple to operate that even a user well into his or her night will figure out how to initiate a self test. The screen can be hard to see in low light conditions, however.
  • come with travel case
  • bright white so hard to misplace
  • occasional false positives
Brand TruBreez
Model No Model
Weight 3.2 ounces
Rating 4.5 / 5.0

4. O-Best Professional

The O-Best Professional is small enough to be tucked into a change pocket, or will add only minimal weight and bulk to your keychain, so there's no excuse not to take this device along when you and your friends go out for a night of carousing.
  • auto power shutoff
  • fold-out mouthpiece
  • inaccurate immediately after drinks
Brand O-Best
Model No Model
Weight 0.3 ounces
Rating 3.9 / 5.0

3. Greenwon Alcohol Analyzer

The Greenwon Alcohol Analyzer has an effective test range between a BAC of 0.0 percent and 0.19 percent, though you should use the reading this unit provides as a guideline to help direct your behavior and not as an ironclad guarantee that you're sober enough to drive.
  • great for novelty use
  • affordable price point
  • ergonomic design
Model pending
Weight 2.4 ounces
Rating 4.8 / 5.0

2. Vio Smartphone

The Vio Smartphone unit syncs with your iPhone or Android phone or tablet to provide you information about the amount of alcohol in the blood of the user. Its paired app removes ambiguity that other self-contained units can create, clearly displaying precise results.
  • comes with drink log
  • offers advice on intoxication levels
  • estimates time to zero blood alcohol
Brand BACtrack
Model BT-M2
Weight 3.2 ounces
Rating 4.9 / 5.0

1. BACtrack Keyring Breath Alcohol Tester

The BACtrack Keyring Breath Alcohol Tester shares its results mere seconds after its user exhales, displaying the detected Blood Alcohol Content reading on its compact but crystal clear red-on-black LCD screen. You'll be able to read the numbers even after multiple drinks.
  • available in several colors
  • one-touch operation
  • average of 75 tests per battery
Brand BACtrack
Model BT-KC10
Weight 5 ounces
Rating 4.8 / 5.0

help support our research

Patreonlogoorange psj5g7Wiki ezvid low poly earth xdypeb

Last updated on March 06, 2017 by Steven John

When not writing or spending time with his family, Steven tries to squeeze in some mountain climbing. In addition to writing for several websites and journals, Steven has published multiple novels.

Thanks for reading the fine print. About the Wiki: We don't accept sponsorships, free goods, samples, promotional products, or other benefits from any of the product brands featured on this page, except in cases where those brands are manufactured by the retailer to which we are linking. For our full ranking methodology, please read about us, linked below. The Wiki is a participant in associate programs from Amazon, Walmart, Ebay, Target, and others, and may earn advertising fees when you use our links to these websites. These fees will not increase your purchase price, which will be the same as any direct visitor to the merchant’s website. If you believe that your product should be included in this review, you may contact us, but we cannot guarantee a response, even if you send us flowers.