Best Leak Detectors Guide

Picking the wrong leak detector is the kind of mistake that costs you time, refrigerant, and repeat call-backs. You arrive on a job, run the detector over a split system, get no reading, patch it up, and leave — only to get a call three weeks later that the system is low on gas again.

Sound familiar? The right tool finds the leak the first time. The wrong one just gives you confidence you haven't earned.

This guide breaks down every type of refrigerant leak detector available in Australia, compares the top models across price tiers, and gives you a straight answer on which one to buy based on how you actually work. Whether you're an apprentice making your first purchase, a sole trader servicing residential splits, or a facilities team managing a commercial portfolio, this is the buying guide you need.

You can also browse our full range of refrigerant leak detectors available with Australian stock and warranty support.

Reviewed by the HVAC Shop Technical Team | Published: May 2026 | Last reviewed: May 2026

Types of Leak Detectors Overview

Before you compare brands or prices, it helps to understand how each type of leak detector actually works. There are five main technologies used in the field, and each has a different strength. Knowing what you're buying — and why — will save you from a drawer full of tools that half-work on the wrong jobs.

Electronic heated diode detectors are the most common type you'll find on Australian HVAC service vans. They work by passing refrigerant-laden air over a heated ceramic bead. When a halogen-based refrigerant hits the element, it lowers the electrical resistance and triggers an alarm.

They're sensitive, affordable, and fast to respond. The trade-off is that the sensor tip burns out over time — usually after prolonged exposure to high concentrations of refrigerant. This happens when you push the probe directly into a puddle of gas rather than sampling from a distance.

Heated diode detectors are well-suited to residential and light commercial work where you're tracking down leaks on split systems, multi-heads, or small commercial units.

Electronic infrared detectors use an optical sensor that measures how much infrared light is absorbed by the air sample. Different refrigerants absorb specific wavelengths of IR light, which lets the detector identify not just the presence of gas but often the type.

Infrared sensors don't have a consumable heating element, so their sensor life is significantly longer. They tend to cost more upfront — but for a busy service business doing volume work across commercial buildings, plant rooms, or supermarket refrigeration — the lower maintenance cost and higher sensitivity make them worth the premium.

UV dye systems take a different approach entirely. You inject a fluorescent dye into the refrigerant circuit during installation or service, then use a UV lamp to inspect the system later. Anywhere the dye has seeped out glows bright yellow-green.

This method is excellent for confirming a leak location when you already suspect a general area, or for verifying a repair was successful. It's also useful on systems with very slow leaks that electronic detectors struggle to pick up. The limitation is that dye must be added to the system, which some manufacturers void warranties over, and it doesn't help you find leaks in systems that don't already have dye installed.

Bubble solutions are simple and reliable for a narrow use case: pressure testing after installation or repair. You pressurise the system with nitrogen, apply the solution to joints and fittings, and watch for bubbles. It's old school, it costs almost nothing, and it absolutely works.

The downside is that you're working blind on a live system — you can't bubble test while the system is running and under refrigerant charge.

Ultrasonic detectors listen for the high-frequency sound produced when gas escapes through a small gap under pressure. They're particularly useful in noisy industrial environments where electronic detectors can false-alarm, and for detecting air leaks as well as refrigerant.

A good ultrasonic detector can pick up a leak before the concentration is high enough for an electronic detector to register. They work on any gas — not just halogen-based refrigerants — which makes them versatile on mixed-gas commercial sites or for detecting compressed air leaks in plant rooms.

Leak Detector Comparison by Budget

The Australian market breaks down roughly into three price tiers: entry level under $300, mid-range between $300 and $700, and premium above $700.

What you spend should match how often you use the tool and the complexity of the jobs you're doing. An apprentice servicing residential splits doesn't need a $1,200 dual-mode detector. A refrigeration contractor managing supermarket systems across QLD absolutely does.

At the entry level, the Inficon TEK-Mate is the benchmark. It's a straightforward heated diode unit that handles the common HFC and HCFC refrigerants you'll encounter on residential and light commercial jobs.

The sensor tip is replaceable — keep a couple of spares in the van. If you push the probe into a high-concentration area, you'll burn through a tip faster than you expect. The TEK-Mate is also sold in Australia under the Javac badge, so if your local trade supplier carries Javac, you may be looking at the same core unit.

In the mid-range, the Fieldpiece DR82 stands out as one of the better-value infrared options available in Australia. Infrared sensors don't burn out the way heated diode tips do, so the running cost is lower over time even if the purchase price is higher.

The Fieldpiece SRL8 sits at a similar price point but uses heated diode technology — it's more sensitive in some conditions but requires sensor replacement. Your choice between the two often comes down to how frequently you're doing leak detection and whether sensor replacement cost matters to your workflow.

At the premium end, the Inficon D-TEK Stratus offers dual-mode operation, combining heated diode sensitivity with infrared confirmation. For refrigeration contractors working on large supermarket systems or commercial chillers, the ability to switch modes and confirm readings is worth the investment.

Callbacks on a commercial contract are expensive — in labour, in refrigerant, in client trust. A tool that reduces false positives and missed leaks pays for itself quickly.

Heated Diode vs Infrared Technology

This is the comparison that matters most for day-to-day buying decisions in Australia. Both technologies find refrigerant leaks, but they work differently, fail differently, and suit different work patterns.

Heated diode technology has been the trade standard for decades. The sensor element is inexpensive to manufacture, which keeps the unit cost down. Sensitivity is generally excellent for HFC refrigerants like R-410A and R-32 — the dominant refrigerants in Australian residential and commercial HVAC systems right now.

The issue is sensor life. A heated diode tip exposed to a significant refrigerant leak will degrade. If you're not replacing the tip regularly, your detector starts giving weak or absent readings — and you don't always know it's happened.

The consequence is a missed leak, a repeat job, and a frustrated client. Always carry spare tips and replace them on a schedule, not just when the detector seems off.

Infrared sensors avoid this degradation problem entirely. The optical sensor has no consumable element, so sensitivity stays consistent over the life of the tool.

IR detectors also tend to have better selectivity — less prone to false alarms from cleaning products, paint fumes, or other chemicals that can trick a heated diode sensor. On a job site in a commercial kitchen or a hospital plant room, where there are all sorts of ambient chemicals, this matters.

The trade-off is cost. A quality infrared unit is more expensive upfront, and the technology is more complex to repair if something goes wrong internally.

For residential work, heated diode wins on cost-per-job. If you're running 4–5 residential service calls a day, a quality heated diode unit with fresh tips will find what you need.

Infrared is the better investment for commercial work or refrigeration — any situation where sensor consistency and false-alarm resistance matters more than upfront cost.

Sensor lifespan is a real-world consideration that often gets glossed over in product descriptions. A heated diode tip from a quality manufacturer like Inficon or Fieldpiece will last considerably longer than a cheap generic tip — even if the cheap tip looks identical.

If you're buying replacement tips for your TEK-Mate or SRL8, buy genuine parts. A counterfeit or underspec tip that gives you a false "all clear" on a leaking system is a liability, not a saving.

Understanding technique matters as much as the tool itself. The best detector in the world won't find a leak if you're moving the probe too fast across a valve core. Hvac Shop's how-to guide is a well-regarded practical reference used by many Australian techs.

Top Brands in Australia

The Australian market for refrigerant leak detectors is dominated by a handful of brands. Knowing their reputations helps you understand what you're getting, who supports it locally, and how easy it is to get parts and service.

Inficon is the most recognised name in leak detection globally and has strong representation in Australia. The TEK-Mate is their entry-level workhorse — straightforward, reliable, and widely available through Australian trade suppliers.

The D-TEK Stratus is their flagship electronic detector, offering dual heated diode and infrared modes in one unit. If you're buying for a commercial operation and need long-term parts support, Inficon is a safe choice.

Fieldpiece has built a strong following among Australian HVAC technicians, particularly for their system approach. Their tools are designed to work together via an app, which suits techs who want to log data and document jobs digitally.

The DR82 is their infrared refrigerant leak detector and one of the better mid-range IR options available here. The SRL2 and SRL8 are heated diode options at different sensitivity and price points. Fieldpiece gear is well-regarded for build quality and the added value of their connected ecosystem.

Javac is an Australian brand with a long history in the trade. Their leak detector range has historically included rebranded Inficon units — the Javac equivalent of the TEK-Mate is a case in point.

This isn't a negative: it means you're getting proven Inficon technology with local Javac distribution and support. Confirm with your supplier which Inficon model it corresponds to so you know which replacement tips to order.

CPS Products is another brand present in the Australian market, offering both heated diode and UV dye kit options. Their range appeals to shops that want to consolidate suppliers across manifold gauges, recovery equipment, and leak detection.

Their detector range is competent at entry to mid-range price points, though they don't have the same premium-end profile as Inficon in Australia.

Leak Detector Selection by Application

The type of work you do should drive your choice far more than brand preference. Here's how to match the tool to the job.

For residential split systems — the bread and butter of most Australian service techs — an entry-level heated diode unit like the Inficon TEK-Mate is entirely sufficient. The leaks you're finding are typically at flare joints, valve cores, or copper line sets, and the refrigerant volumes involved are modest.

A well-maintained TEK-Mate with fresh tips will find these leaks reliably. There's no business case for spending $800+ on a premium detector if your whole day is residential splits in the suburbs. The money is better spent on fresh replacement tips and keeping the tool in calibration.

For commercial HVAC — multi-zone VRF systems, air handlers, large commercial split systems in office buildings or retail centres — the DR82 or a comparable infrared unit becomes the better choice. Commercial jobs involve more complex pipework, longer line sets, and often more refrigerant.

A missed leak on a commercial system costs more to diagnose a second time, and the client relationship is more formal. The infrared sensor's resistance to false alarms matters here. The last thing you want is to call a leak detection clear on a system that's actually losing gas.

For large commercial refrigeration — supermarkets, cold storage facilities, food processing plants — the D-TEK Stratus or a comparable dual-mode premium detector is the right investment. These systems carry significant refrigerant charges.

A leak on a rack system can mean hundreds of kilograms of lost refrigerant and serious compliance obligations. Australian obligations under GEMS and the SGG regulations require operators of large refrigeration systems to meet strict standards around leak detection, reporting, and repair. A quality detector with documented sensitivity is part of operating these systems responsibly.

For apprentices making their first tool purchase, the recommendation is almost always an entry-level heated diode unit. Learn technique first. Understand how refrigerant behaves, where leaks typically occur, and how to move the probe correctly.

A well-used cheap tool will outperform an expensive tool used carelessly. Once you've got a few years behind you, you'll know exactly which upgrade makes sense for your work pattern.

For service business fleet management, a tiered approach works best in practice. Equip senior technicians with mid-range infrared or dual-mode detectors — these techs handle the complex jobs and the commercial clients where callbacks are most damaging.

Equip apprentices and first-year techs with quality entry-level heated diode units. Keep a premium dual-mode detector in the workshop for large or complex diagnostics. Your tool investment scales with the skill and responsibility level of the user.

Where to Buy Leak Detectors in Australia

Where you buy matters almost as much as what you buy. Australian stock availability, genuine warranty support, and access to replacement parts — especially sensor tips — are practical concerns that generic online marketplaces often can't guarantee.

Specialist online HVAC suppliers like HVAC Shop offer Australian stock, proper warranty support, and the ability to ask technical questions before you buy. If you're not sure whether a model is compatible with the refrigerants you work with most, you can get an answer from someone who actually knows the product.

That's worth more than a marginally lower price from a grey-market listing that ships from overseas with no local warranty.

Trade suppliers — Beijer Ref, Air-Met Scientific, Exact Climate, and the established refrigeration trade wholesalers — also carry quality detector brands and often have accounts available for businesses. If you need formal invoicing for fleet replacement, your trade account may be the right channel.

Bunnings is a common question. The honest answer: Bunnings doesn't carry professional-grade refrigerant leak detectors. They stock basic gas detectors for LPG and natural gas household use — these are not the same tool and are not appropriate for HVAC refrigerant work.

A combustible gas detector set up for LPG may not detect R-410A or R-32 at all. Buy from a specialist.

Australian stock matters for more than shipping time. Warranty claims on a unit purchased from an overseas marketplace can be difficult to pursue if the local distributor doesn't recognise the serial number range.

Replacement sensor tips purchased from overseas listings may be counterfeit or out-of-spec. The cost saving on a grey-market unit disappears fast if tips degrade after 20 uses or a warranty claim goes nowhere. Stick to authorised Australian channels.

Get the Right Leak Detector

Here's the short version: match the tool to how you work.

For residential and light commercial HVAC, an entry-level heated diode unit like the Inficon TEK-Mate is a solid, cost-effective choice. Keep the tips fresh, use good probe technique, and it will serve you reliably for years.

For mid-to-large commercial work or a busy service fleet, step up to an infrared or dual-mode unit. The Fieldpiece DR82 or Inficon D-TEK Stratus are both well-supported in Australia and offer significantly longer sensor life and better false-alarm resistance.

For large refrigeration systems and commercial installations, the dual-mode premium tier is the right investment, full stop.

Whatever tier you're shopping in, buy from an Australian specialist with genuine stock. Get replacement sensor tips at the same time if you're buying a heated diode unit.

The HVAC Shop team can help you confirm which model suits your refrigerant mix, your work volume, and your budget. Browse the full range of refrigerant leak detectors available now with Australian stock, or contact us if you want a straight recommendation before you buy.