Vacuum Gauges for HVAC Pros – Accurate & Reliable

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Vacuum Gauges (Micron Gauges) for HVAC Pros – Accurate & Reliable

Deep vacuum isn’t a guess – it’s a number. Our range of HVAC vacuum gauges (micron gauges) lets you prove a clean, dry system before charging. From split-system installs and VRF commissioning to commercial refrigeration and auto A/C, these gauges are built for real-world conditions across Australia.

What a Vacuum / Micron Gauge Does (and Why It Matters)

A vacuum gauge, often called a micron gauge, measures the absolute pressure in a system as you pull a vacuum. Instead of relying on a compound gauge at the pump, you can see exactly how deep the system has been evacuated and whether it’s holding.

Removes air and non-condensables that can cause high head pressure and reduced capacity.
Helps boil off moisture, preventing freeze-ups, internal corrosion and acid formation.
Verifies system tightness during a standing vacuum (decay) test.

Key Features to Look For in an HVAC Vacuum Gauge

Digital accuracy & resolution – clear readings in the low-micron range so you know when you’re at or below your target.
Wireless connectivity & logging – monitor evacuations from your phone, tablet or manifold, and capture results for commissioning reports.
Rugged, weather-resistant housing – impact-resistant, sealed gauges that handle dust, rain and job-site knocks.
Flexible mounting & couplers – angled couplers and compact bodies that fit on tight service ports.
A2L / R32 compatibility – gauges, hoses and core tools suitable for use with R32 and other A2L refrigerants, when installed according to manufacturer instructions.
Easy maintenance – removable filters, replaceable seals and good protection against oil contamination.

Best-Practice Use – Getting Meaningful Micron Readings

Mount on the system, not at the pump – place the gauge on the system, ideally away from the pump (for example on a service port after core-removal tools) so it measures the last part of the system to reach target vacuum.
Use large-bore hoses and remove cores – short, large-diameter vacuum hoses and core-removal tools dramatically improve evacuation speed and gauge response.
Target a deep, stable vacuum – many technicians aim for a deep vacuum in the sub-500 micron range, then isolate the pump and perform a standing test to confirm the system remains under target, always following the equipment manufacturer’s specifications.

Note: Only licensed refrigeration and air conditioning technicians should work on pressurised refrigerant circuits. DIY users should engage a licensed professional for any work involving connection of vacuum pumps and gauges to live systems.

Recommended Pairings & Related HVAC Tools

To get the most from your vacuum gauge, pair it with:

A quality refrigerant vacuum pump (dual-stage, suitable CFM) from our Vacuum Pumps collection.
Manifold & refrigerant gauges for system pressure readings and leak checks.
Refrigerant leak detectors to find leaks before or after evacuation.
Air conditioner cleaning bags and cleaning kits to keep indoor work clean during servicing.

For a full walkthrough, check out our guide: How to Set Up a Vacuum Pump: Step-by-Step HVAC Guide .

Why Buy Vacuum Gauges from HVACShop?

Trade-ready brands – Fieldpiece, Testo, Javac, Mastercool, Robinair and more, chosen for Australian HVAC and refrigeration work.
Fast Australian shipping – local stock and trusted carriers to get tools to site quickly.
Price Match Guarantee on identical stocked items, plus trade discounts for contractors where applicable.
Local support from people who understand deep vacuum, evacuation workflows and Australian standards.

Vacuum / Micron Gauges – Frequently Asked Questions

Do I really need a micron gauge if I have a good vacuum pump?

Yes. The pump removes air and moisture; the micron gauge shows how deep the system has been evacuated and whether it is holding during a standing vacuum test. Without a gauge, you are guessing, not verifying.

What micron target should I aim for?

Many HVAC technicians aim for a deep vacuum below about 500 microns, then isolate the pump and run a standing test to confirm the system remains under target. Always follow the equipment manufacturer’s specifications and current industry codes of practice.

Where should I connect the vacuum / micron gauge?

Best practice is to connect the gauge on the system rather than at the pump, often on a service port via a T-piece or core-removal tool. This location is the last part of the system to reach your target vacuum and provides a more realistic reading.

Can I use the same vacuum gauge for R32 and other A2L refrigerants?

Many modern digital vacuum gauges are compatible with R32 and other A2L refrigerants, but you must confirm compatibility in the product manual and follow relevant codes of practice and manufacturer instructions. Your vacuum pump and other connected equipment must also be rated for A2L use.

Digital vs analogue vacuum gauge – which is better for HVAC work?

Digital micron gauges are generally preferred for HVAC and refrigeration work because they offer better resolution in the low-micron range and often provide wireless monitoring and logging. Analogue compound gauges alone are not accurate enough to confirm deep vacuum.

How do I look after my vacuum gauge?

Keep fittings clean and dry, cap ports when not in use, avoid oil contamination by not leaving the gauge directly on the pump during operation, and store it in a protective case. Follow the manufacturer’s instructions for maintaining filters and seals.