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  • BreathKey Keychain Breath Alcohol Tester with Fuel Cell Sensor - World's Smallest Breathalyzer
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BreathKey Keychain Breath Alcohol Tester with Fuel Cell Sensor - World's Smallest Breathalyzer


Price: $69.95 & FREE Shipping. Details
In Stock.
Sold by OmegaPoint Systems and Fulfilled by Amazon. Gift-wrap available.
  • World's smallest and lightest breath alcohol tester - weighs less than an ounce
  • The only keychain breath tester to use fuel cell sensor technology, the same type that is used in police equipment
  • Made in the USA by the only US manufacturer of personal breathalyzers.
  • Backed by 25 years of design experience in the breathalyzer industry.
  • One year warranty, with our own service and calibration facilities.

Frequently Bought Together

BreathKey Keychain Breath Alcohol Tester with Fuel Cell Sensor - World's Smallest Breathalyzer + BACtrack S80 Pro Breathalyzer Portable Breath Alcohol Tester + BACtrack Breathalyzer Mouthpieces Reusable Breath Alcohol Tester Mouth Piece Covers, Pack of 50
Price for all three: $217.93

Buy the selected items together


Important Information

Safety Information
Please follow the directions in the operation manual for best results.

Legal Disclaimer
Actual product packaging and materials may contain more and different information than what is shown on our website. We recommend that you do not rely solely on the information presented and that you always read labels, warnings, and directions before using or consuming a product. Please see our full disclaimer below.

Product Description

The BreathKey Model g10 is the smallest and lightest breathalyzer in the world, but it is big on features and quality. Unlike other bulky breathalyzers, it easily fits on a keychain so you can take it with you wherever you go. It has an advanced backlit display with simple plain English prompts. One button operation gives results in seconds. And it is the only keychain breathalyzer that has a fuel cell alcohol sensor, the same type that is used in police equipment. The BreathKey breath alcohol tester has a one year warranty and a lifetime battery. Its accuracy and performance have been certified by the FDA. While all other consumer breathalyzers sold in the US are designed and manufactured overseas, the BreathKey line of breathalyzers is engineered and built in the US, utilizing 25 years of experience in the design and manufacture of breathalyzers. Our support and calibration services are also based stateside, with a one-day turnaround in most cases.

Product Details

  • Product Dimensions: 2.4 x 1.4 x 0.6 inches ; 0.6 ounces
  • Shipping Weight: 0.5 ounces (View shipping rates and policies)
  • ASIN: B000EB5MJY
  • UPC: 094922699817
  • Item model number: g10
  • Average Customer Review: 3.7 out of 5 stars  See all reviews (128 customer reviews)
  • Amazon Best Sellers Rank: #18,989 in Health & Personal Care (See Top 100 in Health & Personal Care)
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Customer Reviews

This thing never gives me the same reading three times in a row.
S. Lee
The product is great, very easy to use, what I deem to be a reasonably accurate readout.
E. Coley
It has been a few months now and he has done much better about driving drunk.
Amazon Customer

Most Helpful Customer Reviews

138 of 140 people found the following review helpful By Picky picky picky on May 10, 2008
Verified Purchase
This is an update. I've owned my Beathkeys for 5 years now. They are still working properly and are used at least weekly. This is a very good product and has the potential to save your driver's license or even your life. I bought them from Amazon and am a real customer, not a troll or associated with the company. Please read some of my other reviews to verify that I'm not a single product reviewer. I never trust those reviews myself.

The "Breathkey" is a very compact, light and convenient device. It seems accurate and gives me a reading in line with how I feel. It reads out in thousandths of a percent - there's a world of difference between 0.081% and 0.079% in terms of a DUI. I like it more the longer I own it. I have just purchased a second BreathKey to keep in my car, whilst the other one lives in my briefcase. (As an aside, I have a "friend" who suggests it's small enough to keep in my "pocket protector" with all of my pens). I live in the Sonoma Wine Country and go on a lot of tastings. I now find I spit much more wine than I'll swallow.

Caveats-

1) I've noticed that the first result often differs from subsequent results, so I always test twice and believe the highest reading.

2) You must wait 20 minutes after you finish a drink to use it. The residual alcohol in your mouth will otherwise give a false high reading (as would, I assume, a police unit). I find rinsing my mouth with water reduces the residual alcohol too, but not quite as much as waiting.

3) If you get the error message, "blow hard" or, "blow long" it's for the next test, not the one you're doing.

4) It seems to take a rather long time (30 to 45 seconds) to reset between tests, this is only an issue if you have multiple people testing.
Read more ›
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65 of 67 people found the following review helpful By Jason A. Su'a on May 15, 2009
Many reviews of these FST say that the readings were varied. As a cop myself, many people do not know that you must wait 20 minutes from your last sip or drink to get an accurate reading. So keep that in mind when buying this product. For the most part, a majority of these FST's are accurate, if you use them correctly.
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83 of 88 people found the following review helpful By Martin A Hogan HALL OF FAMETOP 500 REVIEWER on April 11, 2008
Verified Purchase
UPDATE: After receiving many pro-con comments, I found another product that is definitely more accurate. Hope this link is helpful: BACtrack BT-M5 Mobile Breathalyzer Smartphone Alcohol Tester for iPhone, White.

I purchased this Breathalyzer over others, as its accuracy is FDA certified. The fuel sensor is the same used by police and the battery is long lasting. When I tried it, I was stupefied by the results.

After turning on the button, it simply asks you to WAIT, then it will beep and ask you to BLOW into the small hole for four seconds (four beeps) until a solid beep occurs. After a minute or so, your test results will appear. I intentionally measured two shots of vodka (1.5 oz. each) with a tall soda mix and drank it over a 30-minute time slot. Then I waited 20 minutes. I weigh 190 pounds and had an empty stomach. My blood alcohol level was 0.11 and I felt absolutely sober! 0.08 is the legal limit in most states.

Your blood alcohol will not change if you eat or drink water or coffee. Only time will eliminate alcohol from your system. It took nearly 70 minutes before I was under 0.08. That was very scary. I checked my blood alcohol several times and the results were very steady. I would advise getting this device and showing your friends their results. My results may not be the same as yours, but why take a chance? Getting busted will cost you a lot more than over $10,000 in the USA (revoked license, insurance rates rise, etc.).
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82 of 88 people found the following review helpful By D. MCGUE on February 15, 2007
Verified Purchase
I think this breathalyzer is excellent! The results are right where I expected them to be depending on how much I had to drink. Much better than a DUI!

I have two suggestions for getting an accurate reading:

1. Do not take a deep breath before blowing into the breathalyzer. All that extra air will dilute the alcohol vapor that goes into the analyzer.

2. When blowing into the breathalyzer, try your best to capture the end of your breath. That will give you a much more accurate reading. Think about it . . . it makes sense . . . you would want to measure the alcohol deep in your lungs to get the best results. I've tried it using the first part of my breath one day and got a reading of .056, a minute later, using the "deep lung" air, the reading was .078. Trust me . . . the cops will take the "deep lung" air for the test if you're pulled over.
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22 of 24 people found the following review helpful By Business Author 2 on September 15, 2006
Inexpensive, compact, easy to use. The best way yet to prove to myself that perhaps I shouldn't be driving. I am very conservative about driving after drinking ... but how many times have I been at a party, managed the cocktails to "1 per hour", and then wondered if I've crossed the line during the evening. My 'perfect' self discipline has been easily confirmed several times with the breath key. Great device - and FDA approved - 1st class! My business associates will find a very useful 'corporate gift' this year - before the Christmas/New Year's parties begin.
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33 of 38 people found the following review helpful By J. Huelsnitz on January 11, 2009
I ordered this product as a gift to my 22 year old son. Being the age he is, he tends to go out drinking with his friends so I thought it would be a good idea. I researched similar products but I was very particular with what I wanted: small, fits on a keychain, no accessories needed to use, easy to carry on you at all times, etc. Another important feature I wanted was a breathalyzer which would read out down to the 100th number. I didn't want drunk/not drunk nor a .08 reading vs .07, I wanted .071 or .079 as there is a big difference when deciding on having 'just one more'. This is the only product I found with all the features I wanted! Regardless of price! My son has had it now for about a month and loves having it! Not to mention all the other party goers want to use it also which is wonderful! Anything to keep the roads and our kids safer! I would highly recommend this product to anyone looking for a good breathalyzer!
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Most Recent Customer Reviews

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