A cheap breathalyzer can be a sensible buy if you know what the low price leaves out. Most testers at the bottom of the market use a semiconductor sensor, publish no numeric accuracy and need recalibration sooner, while a small step up buys a fuel cell that is alcohol specific and steadier. This page sorts budget options by the makers' published figures and shows the running costs behind a low sticker.
BACtrack Go, a budget semiconductor keychain unit with a 0.000 to 0.400% BAC range, a fold-out mouthpiece and a 1 year warranty.
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BACtrack C6, which brings a BluFire fuel cell to a keychain size and works with or without the BACtrack app.
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Single-use crystal tubes with a printed cut-off, because they need no batteries and no calibration.
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| Model | Sensor | Stated accuracy | Calibration | Best for |
|---|---|---|---|---|
| BACtrack Go | Semiconductor | Not published by the maker | Every 6 to 12 months, send-in service | Lowest cost reusable checks |
| BACtrack C6 | Fuel cell | Not published by the maker | Send-in service, interval not published for this model | Budget fuel cell on a key ring |
| BACtrack C8 | Fuel cell | Not published by the maker | Send-in service, interval not published for this model | Mid-range step up with app |
| Single-use crystal tube | Chemical color change | Qualitative at the printed cut-off | None required | Rare, one-off checks |
| AlcoHAWK Pro | Semiconductor | Evaluated at 0.008% and 0.032% only | Every 6 to 12 months per the 2005 manual | Legacy model, see alternatives |
Price tracks the sensor first. A semiconductor sensor is cheap to build but can react to other substances and drifts faster, while a fuel cell reacts electrochemically with alcohol and stays steadier. Our fuel cell vs semiconductor breathalyzer comparison explains the chemistry.
The second loss is a published tolerance. No budget model on this page has a numeric accuracy figure from its maker, which leaves you no stated benchmark to judge a reading against.
This is an estimate. It cannot tell you whether you are safe or legal to drive. If you have been drinking, do not drive.
The third is battery reach. The Go lists roughly 50 to 75 tests on one AAA battery depending on which maker document you read, while the C6 and C8 list about 250. For a device you pull out every weekend, that difference shows up quickly.
Spec source: maker's published specifications
Who it suits: an occasional user who wants a pocket tester and accepts a rough reading.
What to know: there is no published accuracy, the battery covers relatively few tests, and the manual says the result cannot be used in court or to decide whether to drive. See the bactrack go keychain breathalyzer review.
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Spec source: maker's published specifications
Who it suits: buyers who want the stability of a fuel cell without moving into the mid-range.
What to know: the maker publishes no numeric accuracy and the range tops out at 0.300% BAC. Its size and weight figures differ between maker pages, so expect something close to a 9V battery in size. Read the bactrack c6 review.
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Spec source: maker's published specifications
Who it suits: someone who would otherwise buy a budget unit twice and prefers a mid-range fuel cell with its own display.
What to know: it sits above the budget band, the maker uses only the words professional-grade accuracy with no number, and the battery is not included according to the product page. See the bactrack c8 review.
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Spec source: maker's published specifications
Who it suits: someone who needs an answer once or twice a year and would never service a reusable unit.
What to know: each tube works once and gives a color, not a number. Our disposable breathalyzer page covers how to read them.
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The AlcoHAWK Pro is a semiconductor tester whose owner's manual dates from 2005. That manual says accuracy was established only at 0.008% and 0.032% BAC and was not evaluated above 0.032%, and it calls the unit a screening device. The maker's website no longer exists and redirects to another brand, so current availability and recalibration service cannot be confirmed. If you find one, read our alcohawk pro review first, then compare it with the current picks above.
The sticker is only the first payment. Add these before you decide which tester is really cheap.
Be careful with listings that promise police grade results without naming a sensor, publish no detection range or offer no manual to read before buying. A product with no named maker leaves you without a calibration path or warranty contact. Stick with makers that publish the sensor, the range and a calibration recommendation, and use our best breathalyzer ranking when you are ready to spend more.
Treat the reading as a rough guide. Wait at least 15 minutes after drinking, eating, smoking or mouthwash (20 if your BACtrack manual says so), blow for the full time, and leave a minute or more between tests. Keep the unit out of a hot or freezing car, since the Go lists an operating range of 50 to 104 F.
Budget units can give a useful rough reading, but the models on this page publish no numeric tolerance, so you cannot know how close they are without calibration checks.
Usually yes, because a fuel cell is alcohol specific and more stable, which is why the C6 is our value pick over the Go for regular use.
BACtrack lists the Go, C6 and C8 on its paid send-in calibration service, so compare the service fee with the cost of a new unit before you send one in.
It depends on use, calibration and battery life, and the Go manual suggests recalibration every six to twelve months or monthly with daily use.
Tubes make sense for one or two checks a year, while a reusable tester costs less per test once you check regularly.
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