Not all breathalysers are built the same.

If you’re comparing devices online, the most important difference isn’t the screen, the price, or the design.

It’s the sensor technology inside.

When choosing a breathalyser in NZ, you’ll typically see two types:

• Semiconductor sensors

• Fuel cell sensors

Here’s what that means — and why it matters.

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What Is a Semiconductor Breathalyser?

Semiconductor sensors are commonly found in lower-cost consumer devices.

They detect alcohol by measuring changes in electrical resistance when exposed to alcohol vapour.

Pros:

✔ Lower upfront cost
✔ Widely available
✔ Suitable for occasional checks

Limitations:

• Can react to substances other than alcohol (e.g. mouthwash, perfume, acetone)

• Less stable over time

• More prone to sensor drift

• Higher potential return rates

They’re generally fine for casual use — but they’re not considered professional-grade.

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What Is a Fuel Cell Breathalyser?

A fuel cell breathalyser uses an electrochemical sensor designed to react specifically to alcohol molecules.

This technology is widely used in:

• Professional breathalysers

• Workplace alcohol testing devices

• Many law-enforcement-grade units

Why Fuel Cell Technology Is Better

Fuel cell sensors:

✔ Are highly specific to alcohol
✔ Provide more stable, consistent readings
✔ Reduce false positives
✔ Maintain accuracy over time
✔ Offer greater long-term reliability

If you’re using a breathalyser to decide whether you can legally drive, accuracy isn’t optional.

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Why Accuracy Matters (Especially in NZ & AU)

In New Zealand and Australia, the legal limit for most full licence holders is 0.05 BAC.

Many drivers underestimate their level the morning after drinking.

If a device gives a false low reading, the consequences can include:

• Licence suspension

• Loss of employment (especially for tradies or fleet drivers)

• Insurance issues

• Criminal charges

That’s why fuel cell breathalysers are generally recommended for drivers who want more dependable readings.

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Fuel Cell vs Semiconductor: Quick Comparison

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Which Breathalyser Should You Choose?

Choose a semiconductor device if:

• You want the lowest upfront cost

• You test very occasionally

• You’re looking for a basic indication

Choose a fuel cell breathalyser if:

• You drive regularly

• Your licence affects your job

• You want higher reliability

• You want long-term value

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Why Alcolyzer Uses Fuel Cell Technology

Alcolyzer’s rechargeable professional-grade model uses fuel cell sensor technology, combined with:

• Long battery life

• Customisable settings (BAC units, language, time and alerts)

• Clear digital display

It’s designed to provide drivers in NZ and AU with greater confidence before they drive.

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The Bottom Line

The difference between semiconductor and fuel cell breathalysers isn’t cosmetic.

It’s about accuracy and reliability.

If you’re checking before driving — especially the morning after — a fuel cell breathalyser offers a higher level of protection.

Alcolyzer — Check before you drive.