Breathalyser Buying Guide: How to Choose the Right One

Written by our Melbourne team and reviewed against Australian Standard and manufacturer sources, October 2026.


For most people, the right breathalyser is a fuel-cell personal unit bought from a supplier that can also calibrate it, and used at least 20 minutes after the last drink. Fuel-cell sensors respond to alcohol specifically, where cheaper semiconductor sensors can react to other compounds on the breath. Check whether the specific model holds AS 3547 certification rather than assuming it does: certification is voluntary in Australia and granted per model, not per brand. Budget for calibration every 12 months. And treat every reading as a guide, because a consumer breathalyser gives an indicative result, not a legal one. This guide covers how the devices work, what makes one accurate, what the Australian Standard does and does not tell you, and which type suits each buyer.


How does a breathalyser work?


A breathalyser estimates blood alcohol concentration (BAC) from the alcohol in your breath. Alcohol in the bloodstream passes into the air in the deep part of the lungs at a concentration that tracks blood alcohol closely, so a device that measures alcohol vapour in a deep-lung sample can convert that measurement into an estimated BAC. Every handheld breathalyser, from a $139 personal unit to a workplace instrument, captures a breath sample and passes it over a sensor that produces an electrical response in proportion to the alcohol present.


The sensor is where the devices differ. A fuel-cell sensor runs an electrochemical reaction. In Andatech's description, "Alcohol compounds, specifically ethanol compounds, are oxidised on the platinum surface, generating electrons that flow through the circuit as electric current." More alcohol means more current, and the device reads that current as a BAC figure.


A semiconductor sensor uses a small heated tin-dioxide bead. In Andatech's words, "When breath alcohol hits the heated surface, the sensor's electrical resistance changes, and a microprocessor converts that change into an estimated BAC reading." That resistance change is the root of the semiconductor sensor's main weakness, covered next.


Both types need a proper sample. A short, shallow puff gives the sensor mouth and upper-airway air rather than the deep-lung air that reflects blood alcohol, which is why better devices measure breath flow and reject a sample that is too small.


Fuel cell vs semiconductor sensors


The sensor is the single biggest factor in what a breathalyser costs and how far you can trust it.


Fuel-cell sensor Semiconductor sensor
Alcohol specificity High: the electrochemical reaction responds to ethanol Low: reacts to a range of volatile compounds
Accuracy and consistency Repeatable from test to test and across the BAC range, including higher concentrations Less consistent, particularly at higher BAC levels
Drift between calibrations Slow: holds calibration for longer Faster: needs recalibration more often
Response to other substances Not typically affected by breath acetone from diabetes or low-carbohydrate diets Can react to "cigarette smoke, breath acetone, and volatile chemicals such as hairspray and gasoline vapor" (BACtrack)
Typical price From about $139 for personal units; $539 and up for workplace handhelds The lowest-priced devices on the market
Calibration needs Every 12 months More frequent, because the sensor drifts faster
Best for Regular personal testing and all workplace testing Occasional, low-stakes checks only

A fuel cell is far more alcohol-specific than a semiconductor sensor, which is why our range is built on fuel-cell sensors. The cheaper sensor's reaction to acetone matters more than it sounds: a person on a low-carbohydrate diet, or someone with diabetes, can carry enough acetone on the breath to register as alcohol on a semiconductor device. Cigarette smoke and vapours from fuel or aerosols can do the same.


One point the usual comparison leaves out: no sensor, fuel cell included, can tell alcohol still in your mouth from alcohol that has reached your lungs through the bloodstream. A fuel-cell device tested straight after a sip, a mouthwash rinse or a liqueur dessert will read alcohol, because alcohol is genuinely there. It is simply not the alcohol in your blood. A fuel cell greatly reduces false readings from non-alcohol compounds; it does not remove the need for a sensible testing routine.


What makes a breathalyser accurate?


Accuracy on the day depends on four things, and only the first is printed on the box.


Sensor type comes first. A fuel-cell sensor gives alcohol-specific readings that stay consistent from one test to the next. Among fuel-cell devices, the differences in stated accuracy are smaller than the differences created by the three factors below, so read a listed accuracy figure as a laboratory specification under ideal conditions, not a promise about what you will see at home.


Calibration state comes second. Every sensor drifts with use, time and temperature. A unit that has gone two years without calibration still produces a number; the number has simply moved away from the truth. Andatech recommends calibration every 12 months, and we calibrate to the same schedule.


The testing routine comes third, and it is the factor most buyers underestimate. Alcohol lingering in the mouth and throat is read as breath alcohol, because to the sensor it is. Andatech's guidance: "the alcohol residue from the mouth can be mistaken as alcohol content in deep lung air". The manufacturer's instruction is to wait 20 minutes after your last drink and not to eat, drink or smoke in that time. Mouthwash, breath spray and many cough medicines contain alcohol and reset the clock. Then take a full breath and blow steadily until the device signals it has a sample.


Conditions come fourth. Each model has a stated operating temperature range, so a device left in a hot car or a cold glovebox should return to room temperature before use, and batteries should be changed as soon as the low-battery indicator appears.


The most reliable result, then, comes from a calibrated fuel-cell unit used 20 minutes after your last drink with a full breath. The model matters; the method matters at least as much.


What AS 3547 certification means (and doesn't)


AS 3547 is the Australian Standard for breath alcohol testing devices. The current edition, AS 3547:2019, was published in June 2019 and succeeds the 1997 edition. Certification means a specific model has been tested by an independent laboratory against the standard's requirements for accuracy and reliability.


Certification is voluntary. No law requires a breathalyser sold in Australia to be certified. Andatech, the manufacturer of the range we stock, states in its AS 3547:2019 FAQ that "there is no regulation in Australia that mandates breathalysers sold in the market to be certified." An uncertified device has not been independently tested, which is not the same as saying it is inaccurate.


Certification is per model, not per brand or range. Andatech's FAQ names the Prodigy S and Surety as certified to the 2019 edition, and its August 2023 release confirms the Prodigy 3 has since achieved AS 3547:2019 certification. Of the units we stock, the Surety, Prodigy S and Prodigy 3 are the models we can point to a 2019 certificate for. Other models may be certified to the earlier 1997 edition or described as tested to the standard; ask for the certificate for the exact model rather than relying on a general "Australian Standard" line.


The 2019 edition excludes disposable single-use devices, so a disposable cannot be certified to the current standard at all.


Personal devices are in a transition. On 27 June 2022, Standards Australia extended the transitional period "for personal and single use devices only" until new standards for personal use (AS 5365) and single-use devices (AS X20-702) are published, adding: "For all other devices, AS 3547-1997 is now superseded by AS 3547:2019." In practice, a workplace device should be certified to the 2019 edition, while a personal device may still legitimately reference 1997.


To check a model, look for the edition year in the claim ("AS 3547" alone does not tell you which), ask the supplier for the certificate, and be wary of "approved" or "police" language, which has no basis in the standard. Our Australian Standard AS 3547 page has more detail.


Disposable breathalysers: are they worth it?


A disposable breathalyser is a single-use chemical test. You blow through a tube containing crystals that change colour in the presence of alcohol, then compare the result against a reference mark that indicates whether the sample is above or below a set threshold. There is no sensor, no display and no second test.


That design puts disposables outside the current Australian Standard. AS 3547:2019 excludes disposable single-use devices, and Standards Australia has placed them in a transitional category pending a separate standard, so no disposable sold today can be certified to the current edition. A disposable also cannot be calibrated: whatever accuracy it had when manufactured is the accuracy it has when you open it.


We do not sell disposable breathalysers. They have a legitimate place as a one-off check for someone who will rarely test, and that is where we would leave them. For anyone who expects to test more than occasionally, the arithmetic favours a reusable unit quickly. An entry-level fuel-cell breathalyser costs $139 to $149 at time of writing (October 2026), gives a numerical reading rather than a colour match, can be recalibrated from $55, and will run for years. A disposable suits a single occasion. A fuel-cell device suits a routine.


Which breathalyser is best for you?


The best breathalyser is the one that matches how often you will test, who will use it and what the result is for. The table below groups our range by use case. Prices are at time of writing (October 2026); every model listed was in stock when this guide was published.


Use case What to look for Price band Our range
Occasional personal checks Entry fuel-cell sensor, three-decimal BAC reading, compact body $139–$149 AlcoSense Novo Gen2, Wingmate Pro
Everyday personal use Slimmer or more durable body, faster warm-up and recycle times $199–$289 Sober Mate S5, AlcoSense Verity Gen2, Andatech GT
App-connected personal use Bluetooth link to a phone app for a record of readings $349 AlcoSense Elite 3 with Bluetooth
Higher-spec personal use, or a small vehicle fleet Higher test capacity and build quality; some models add a passive mode for a quick screen without a mouthpiece $430–$590 AlcoSense Zenith Plus, AlcoSense Precision Plus MK5
Workplace handheld screening Test memory and data export, mouthpiece and passive modes, AS 3547:2019 certification where your policy requires it $539–$740 Surety and Prodigy S (both AS 3547:2019 certified), Nexus, Sentry
Fixed-site screening at an entry point Wall-mounted, built for high-volume testing, replaceable sensor module, coin or push-button operation $3,762 Soberpoint 3 wall-mounted

For most private buyers, the first two rows cover it. The Novo Gen2 and Wingmate Pro are the lowest-cost fuel-cell units we sell, and either is a sound first breathalyser. The $199–$289 band buys refinements in speed, size and build rather than a different kind of accuracy, since all are fuel-cell devices.


Workplace buyers should start with the policy, then choose the device. If your policy or an industry requirement calls for AS 3547:2019, the Surety and Prodigy S are the handhelds in our range with that certification. The Prodigy 3 ($3,495, also certified to AS 3547:2019) adds a built-in camera and a direct link to Andatech's Andalink cloud management system for sites that need a full audit trail. The Nexus, which records GPS position and a photo with each test, and the Sentry are the alternatives for programs that do not specify the 2019 edition. Where many people test each shift, the Soberpoint 3 wall-mounted unit takes the handheld out of the process.


The personal breathalysers and workplace and industrial breathalysers collections carry full specifications and current pricing.


Calibration: the cost most buyers forget


Every breathalyser needs calibration, and the cost belongs in your purchase decision alongside the price. Calibration returns the sensor to its reference points after the drift that use, time and temperature cause, and it is the only way to know that a two-year-old device still reads what it did on day one.


The schedule is every 12 months, regardless of how many tests you have run. Our prices at time of writing (October 2026), excluding GST and postage: personal breathalysers from $55 per calibration, workplace handhelds from $130, wall-mounted units from $180. Every calibration includes a calibration certificate. Priority 24-hour turnaround is $25 per unit and two-way return postage $18 per booking. All work is performed in Melbourne by Andatech's in-house technicians, and every device is checked for faults before it is posted back with tracking.


Over five years, a $139 personal unit with four annual calibrations at $55 comes to roughly $360 before GST and return postage, about $72 a year. Details, booking and Melbourne drop-off are on our calibration service page.


Personal vs workplace breathalysers


A personal breathalyser answers one question for one person. A workplace breathalyser has to produce a result that stands up when challenged, which changes the specification: test memory and data export, mouthpiece and passive modes, and in some models GPS, photo capture or a printer. Standards Australia's transitional extension covers personal and single-use devices only; for workplace handhelds and wall-mounted units the 1997 edition is superseded, so 2019 certification is the one to look for.


Workplace and industrial units we supply are calibrated before dispatch and ship with a Certificate of Calibration, which a worker is entitled to ask to see before a test; a result from a device without a current certificate is open to challenge. Personal units do not ship with this certificate.


A device supports a compliant testing program; it does not create one. Procedure, collection, confidentiality and follow-up complete the picture. Our workplace drug and alcohol testing guide covers all of that, and the workplace and industrial breathalysers collection lists the current range.


Frequently asked questions


Are fuel cell breathalysers more accurate than semiconductor ones?


Yes, in general. A fuel-cell sensor responds to ethanol specifically and holds its calibration longer, so readings are more consistent and much less affected by breath acetone, smoke or aerosol vapours. A fuel cell still reads alcohol left in the mouth, so the 20-minute wait after drinking applies to every breathalyser.


Do I need an AS 3547 certified breathalyser?


Not by law. Certification is voluntary in Australia and is granted to a specific model, not a brand. For personal use it is a quality signal rather than a requirement. For workplace testing, check whether your policy specifies AS 3547:2019, and if it does, confirm the edition on the certificate for the exact model.


Can a personal breathalyser tell me if I'm under 0.05?


It can give an indicative reading, which is more useful than guesswork, and a BAC calculator can add an estimate. It is not a legal result. Police use evidential instruments under controlled procedures, and your BAC can still be rising after your last drink. If you have been drinking and are unsure, do not drive.


How often should I calibrate my breathalyser?


Every 12 months, regardless of how many tests you have run. That is the manufacturer's recommendation across the Andatech range and the cycle we use for every device type. Our calibration service starts from $55 (ex GST and postage) and includes a certificate.


Are disposable breathalysers accurate enough?


For a single occasion they can serve as a rough check. They are excluded from AS 3547:2019, cannot be calibrated, and give a colour change against a threshold rather than a reading. We do not sell them. Anyone testing more than occasionally is better served by an entry-level fuel-cell unit.


Buy from a supplier that can also calibrate


Australia Breathalyser is a Melbourne-based specialist supplier of Andatech breathalysers for personal and workplace use. Shipping is free Australia-wide on orders over $175, and calibration is handled in Melbourne by Andatech's in-house technicians, so the device you buy from us can be kept on its 12-month calibration schedule. Browse personal breathalysers or workplace and industrial breathalysers, or call 1300 103 003 to talk through which unit fits.


Sources (accessed October 2026):