UT139S Multimeter: Best True RMS Value in Australia 🇦🇺

If you’ve been scratching your head wondering which multimeter to get for reliable, accurate readings — without paying a fortune — then the Uni-T UT139S True RMS Digital Multimeter is worth a good squiz.

Whether you’re a sparkie, HVAC tech, or a serious DIYer in Queensland, New South Wales, or Victoria, you want gear that works, lasts, and doesn’t cost the earth.

This blog is your one-stop guide to understanding the Uni-T UT139S, its features, and its value in the Australian market.

What we’ll cover:

• ✅ Why the Uni-T UT139S is a great choice for Aussie tradies & DIYers
• ✅ How True RMS works (explained simply)
• ✅ Buyer’s guide: what to look for in a True RMS multimeter
• ✅ Best place to buy the Uni-T UT139S in Australia
• ✅ A real client story from Sydney
• ✅ FAQs about the UT139S

By the end, you’ll know exactly why this affordable True RMS multimeter is winning over Aussies and where to grab yours at the best UT139S Australia price.

Why the Uni-T UT139S Matters in Australia

When it comes to measuring electrical signals, accuracy isn’t optional — especially if you’re working around HVAC systems, switchboards, or appliances with complex loads.

That’s where the Uni-T UT139S True RMS Digital Multimeter shines.

• 🎯 True RMS accuracy – Essential when measuring irregular AC waveforms you’ll find in modern homes and workplaces.
• 🔒 Safer measurements – Rated CAT III 600V & CAT II 1000V to keep you protected.
• 🪙 Affordable True RMS multimeter – Most True RMS meters can cost you around $1,399.99 AUD.
• 🏖️ Built tough for Aussie conditions – Handles humidity, dust, and heat — perfect for jobs from Brisbane to Melbourne.

It strikes that perfect balance of quality and affordability. No more dodgy $20 meters, and no need to splash out on a Fluke unless you want to.

You can find the UT139S in the Uni-T Multimeters collection at HVAC Trade Supply.

How True RMS Works (Without the Jargon)

Let’s break this down so everyone can follow.

Most budget multimeters are “average responding,” which is fine for simple, pure sine-wave AC signals — like you might see coming straight from a power point.

But here’s the catch:

⚡ Many modern devices — think microwaves, computers, HVAC compressors — draw current in weird, non-sinusoidal ways.

This is where True RMS (Root Mean Square) comes in.

• ✅ More precise voltage & current readings on modern loads
• ✅ Safer troubleshooting because you’re seeing the real value
• ✅ Avoids under- or over-estimating currents, which can lead to mistakes

In short: True RMS = trust your readings.

That’s why so many Aussie tradies prefer a True RMS multimeter these days.

Aussie Buyer’s Guide: Choosing a True RMS Multimeter

Before you click “buy now,” here are a few homegrown tips to help you pick the right meter.

🛒 1. True RMS Is Worth It

If you only work with DC circuits or simple AC, you might get by with a cheaper, average-responding meter. But if you’re dealing with HVAC, appliances, or variable frequency drives, True RMS is a must.

🌧️ 2. Think About Where You Work

In Queensland’s sticky summers or dusty Victorian workshops, you’ll want a meter that’s rugged. The Uni-T UT139S has a solid build and a backlit display — perfect for low-light or outdoor jobs.

📋 3. Features You’ll Actually Use

Don’t pay for Bluetooth or logging if you don’t need them. The UT139S gives you:

• AC/DC voltage & current
• Resistance, continuity, capacitance, frequency
• Temperature (with probe included)
• Low-impedance mode
• Backlit display

💸 4. Price & Warranty

The typical Uni-T UT139S Australia price ranges between $1,399.99 AUD. Make sure you buy from a reputable Aussie seller so you get a proper warranty and fast delivery. Avoid grey imports that might leave you high and dry if there’s an issue.

Best Product to Try

After scoping out the competition, we reckon the Uni-T UT139S sits in the sweet spot for Aussie sparkies and DIYers.

• ✅ Affordable (compared to other True RMS meters)
• ✅ CAT III rated safety
• ✅ Temperature & low-impedance modes included
• ✅ True RMS for reliable readings on all loads
• ✅ Local warranty & fast delivery

If you’ve got a bigger budget and want fancier bells & whistles, you can also explore the higher-end Uni-T models here.

Client Story: Michelle from Sydney

"I’d been borrowing my husband’s old meter (which I’m pretty sure came free with something) for years. When I started renovating our kitchen in Sydney, I realised I needed something that actually worked properly. A mate at TAFE told me to grab a UT139S from HVAC Trade Supply. It arrived the same week, and it’s been a lifesaver! Easy to use, the screen lights up beautifully, and I feel much more confident knowing it gives accurate readings on all the appliances. Cheers for the recommendation!" — Michelle, DIY renovator, Sydney NSW

FAQs About the Uni-T UT139S True RMS Digital Multimeter in Australia

🤔 What’s the typical UT139S Australia price?

Usually around $1,399.99 AUD, depending on sales and stock.

📍 Is it available in Queensland, NSW, and Victoria?

Yes — ships quickly to anywhere in Australia, including regional areas.

🛡️ Does it come with an Australian warranty?

Yes, if you buy through authorised sellers like HVAC Trade Supply.

🔌 Is it good enough for professional use?

Definitely. With True RMS, CAT III rating, and solid build quality, it’s great for tradies, apprentices, and serious DIYers.

📦 What’s in the box?

Typically:

• Uni-T UT139S meter
• Test leads
• Temperature probe
• Batteries
• Instruction manual
• Carry pouch (in most cases)
  
  
  
  
  

Ready to Upgrade Your Multimeter?

If you’re in Queensland, New South Wales, Victoria — or anywhere else in this great southern land — and you’re after a reliable, affordable True RMS multimeter, the UT139S should be at the top of your list.

Explore our full range of Uni-T Multimeters here, and order yours today.

Don’t risk dodgy readings — upgrade to a proper meter and work with confidence.