TopTes RT‑389 Leak Detector | Full Review by Lance Mechanics

Hey folks, Lance Mechanics here — and today I’m checking out the TopTes RT‑389 Refrigerant Leak Detector, a compact, USB-C rechargeable tool designed for both HVAC techs and automotive A/C work. Whether you're chasing down leaks in R-134a, R-410A, or the newer R-1234yf systems, this little device might be the one to add to your kit.

In this video, I walk through everything from unboxing and first impressions, to sensitivity settings, screen functions, and real-world testing. With a claimed detection threshold of 3 grams per year, a 90dB buzzer, vibration, and a flexible 14.5" gooseneck, the RT‑389 punches well above its price point.
No batteries needed — just charge it via USB-C and go.
If you're tired of dealing with outdated sniffers or tools that miss small leaks, this one's worth a look.

Product link:
https://amzn.to/419ktrv
Discount code for 10%
ICBJ3HB

🛠 Tools Mentioned:
🔹 TopTes RT‑389 Leak Detector (Amazon): [insert affiliate or product link]
🔹 Works with: R-134a, R-410A, R-1234yf, R-22, R-600a, Propane, and more

👨‍🔧 Perfect For:
HVAC Technicians
Automotive Technicians (especially A/C work)
Mobile Mechanics & DIYers
Anyone chasing down hard-to-find refrigerant leaks

🧠 Key Specs Recap:
✅ Detects as low as 3g/year
✅ CFC, HCFC, HFC, HFO & Hydrocarbon compatible
✅ Audible + visual + vibration alerts
✅ USB-C rechargeable, 8 hours runtime
✅ Flexible 14.5" gooseneck probe
✅ High/Medium/Low sensitivity modes
✅ TFT color screen with graph trend

Got a favorite leak detector? Something better or worse than this? Drop it in the comments — I’m always down to test more gear and compare it on the channel.
Like, subscribe, and stay tuned for more honest tool reviews, diagnostics, and heavy wrenching content.
Lance Mechanics — Wrenches, Wires & Real Talk.

TopTes RT‑389 review, refrigerant leak detector, best HVAC leak detector, automotive A/C leak finder, R-134a leak detection, R-1234yf tool, HVAC tools review, USB-C refrigerant detector, affordable leak detector, A/C leak tester, 2025 HVAC tools, Lance Mechanics, HVAC diagnostics, automotive A/C troubleshooting, refrigerant sniffer