Best Ultrasonic Leak Detector (2026)
5 ultrasonic leak detectors for A/C, EVAP, air brake and shop air leaks, compared by frequency range, display, kit contents and warranty.
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Top picks at a glance
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- 1
Best OverallFOTRIC TD2e9.6/10View on Amazon - 2
Best Dual Modeallsun EM2829.5/10View on Amazon - 3
Best Complete KitVanlison VADY26A9.4/10View on Amazon - 4
Best Contact Probeallsun Pro9.5/10View on Amazon
A tire that goes soft overnight, an air conditioning line that loses its charge, or a hiss under the hood that stops the moment you lean in to listen: the leak is there, but you cannot see it. The best ultrasonic leak detector listens for the high-frequency sound escaping gas makes and turns it into something you can follow to the source. This roundup compares detectors by frequency range, display, kit contents and warranty, using only what each listing states.
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Quick picks
- Best Overall FOTRIC TD2e: 64+ microphone array with a live color soundmap, 2 to 100 kHz range and a 12 month warranty. Check price on Amazon
- Best Dual Mode allsun EM282: 40kHz detection with passive and active modes, adjustable gain and a 1 year warranty. Check price on Amazon
- Best Complete Kit Vanlison VADY26A: Scanner, noise-canceling headphones, storage case, 9V battery and manual in one kit at 0.7 pounds. Check price on Amazon
- Best Contact Probe allsun Pro: 36 to 44KHz detection with a contact probe and focusing cone, plus a 1 year warranty. Check price on Amazon
Picks for the garage
FOTRIC New Ultrasonic Leak Detector
An acoustic camera with a 64+ microphone array that turns ultrasonic sound into a live color soundmap, for A/C, EVAP, air brake and EV battery seal leaks.
Pros
- 64+ MEMS microphone array captures sound from 2 to 100 kHz
- Live color soundmap shows the leak spot on screen
- Scans from 1 to 5 meters with cm-level accuracy
- 12 month warranty term stated
Cons
- No weight or dimensions stated
- No kit contents stated beyond the detector
- No headphones stated in the listing
- No IP or safety certification stated
allsun Ultrasonic Leak Detector Kit
A 40kHz ultrasonic leak detector with passive and active modes, adjustable gain and directional sensing, for HVAC, automotive and sealed systems.
Pros
- 40kHz sensor for air and vacuum leaks
- Passive and active modes for pressurized and sealed systems
- Adjustable gain with directional sensing
- 1 year warranty term stated
Cons
- Spec table disagrees on size: 192 x 50 x 30 mm against 12.24 x 1.85 x 6.06 inches
- No kit contents stated
- No headphones stated in the listing
- No safety certification stated
allsun Pro Ultrasonic Leaking Detector Transmitter
A 36 to 44KHz ultrasonic detector with a contact probe, focusing cone and headset, for air, gas and vacuum leaks in automotive and industrial use.
Pros
- 36 to 44KHz detection for air, gas and vacuum leaks
- Contact probe listens to bearings, valves and pumps
- Focusing cone for long-range detection
- 1 year warranty term stated
Cons
- Not designed for water pipes, plumbing, pools or tires
- No weight or dimensions stated
- No safety certification stated
- No frequency filter stated
Vanlison Ultrasonic Leak Detector
A 38 to 42kHz ultrasonic leak detector kit with adjustable sensitivity, proximity sensing and a noise-isolation headset, for automotive, HVAC and industrial use.
Pros
- 38 to 42kHz detection with adjustable sensitivity
- Proximity sensing raises the alarm rate near the leak
- Kit holds scanner, headphones, case, 9V battery and manual
- 0.7 pounds with a compact 22.8 inch body
Cons
- No warranty term stated
- No safety certification stated
- No contact probe stated
- No transmitter mode stated
Superior AccuTrak VPE PRO Ultrasonic Leak Detector
A professional ultrasonic leak detector kit with a 10 element bar graph, natural sound conversion and a large carry case, for air and vacuum leaks.
Pros
- 0 Hz to 4 kHz natural sound conversion to hear the leak
- 10 element bar graph for a visual indication
- Kit holds detector, battery, case, touch probe, waveguide and headphones
- Large carry case included
Cons
- No detection frequency stated
- No warranty term stated
- Bullets state 6 lbs while the spec table lists 5.3 pounds
- No safety certification stated
Compared on paper
| Model | Shop Score | Detection frequency | Display | Kit | Weight | Warranty |
|---|---|---|---|---|---|---|
| FOTRIC TD2e | 9.6/10 | 2 to 100 kHz | Color soundmap | Not stated | Not stated | 12 months |
| allsun EM282 | 9.5/10 | 40kHz | Not stated | Not stated | Not stated | 1 Year |
| allsun Pro | 9.5/10 | 36 to 44KHz | LED indicator lights | Focusing cone, contact probe, headset | Not stated | 1 Year |
| Vanlison VADY26A | 9.4/10 | 38 to 42kHz | LED and audio alerts | Scanner, headphones, case, 9V battery, manual | 0.7 pounds | Not stated |
| AccuTrak VPE PRO | 9.4/10 | Not stated | 10 element bar graph | Detector, battery, case, touch probe, waveguide, headphones | 6 lbs (bullets); 5.3 pounds (spec table) | Not stated |
Specifications are manufacturer rated, as published on each listing and collected 6 November 2026. Where a listing contradicts itself, both figures are shown.
How the points were given
Each detector is scored out of 10 on performance, build, value, safety and warranty, with the weights published on the How We Pick page. None states a UL, ETL or CSA listing, so all score zero on safety. The FOTRIC, the allsun Pro and the allsun EM282 list warranty terms, and the Vanlison and the AccuTrak do not.
| Product | Shop Score | Perf. /35 | Build /25 | Value /25 | Safety /10 | Warranty /5 |
|---|---|---|---|---|---|---|
| FOTRIC TD2e | 9.6 | 33 | 22 | 20 | 0 | 2 |
| allsun EM282 | 9.5 | 29 | 21 | 21 | 0 | 2 |
| allsun Pro | 9.5 | 29 | 21 | 20 | 0 | 2 |
| Vanlison VADY26A | 9.4 | 28 | 20 | 21 | 0 | 0 |
| AccuTrak VPE PRO | 9.4 | 26 | 20 | 19 | 0 | 0 |
Scores run from 9.2 to 9.8: each product’s point total is placed on that range, so more points always means a higher score.
What the listings tell you
All 5 listings describe ultrasonic detectors for air, gas and vacuum leaks in automotive, HVAC and industrial use. The FOTRIC shows leaks as a live color soundmap from a 64+ microphone array, while the rest use headphones, a bar graph or LED lights to point at the leak. The allsun Pro is not designed for water pipes, plumbing, swimming pools or tires, and the AccuTrak listing disagrees with itself on weight, with 6 lbs in the bullets and 5.3 pounds in the spec table.
Buying guide: the best ultrasonic leak detector
Frequency range
The FOTRIC covers 2 to 100 kHz, the allsun Pro covers 36 to 44KHz, the Vanlison covers 38 to 42kHz and the allsun EM282 works at 40kHz, while the AccuTrak states an audio output of 0 Hz to 4 kHz instead of a detection frequency. A wider range covers more leak types, so match the range to the systems the shop sees.
Display: soundmap, bar graph or headphones
The FOTRIC overlays a live color soundmap on a screen, the AccuTrak shows a 10 element bar graph, and the allsun Pro and the Vanlison use LED indicator lights. Headphones come in the Vanlison, allsun Pro and AccuTrak kits for listening in a noisy shop, so pick the display that fits the bay.
Kit contents
The Vanlison kit holds a scanner, noise-canceling headphones, a storage case, a 9V battery and a user manual. The AccuTrak kit holds a detector, a battery, a large carry case, a touch probe, a waveguide and noise blocking headphones. The allsun Pro adds a focusing cone and a contact probe for mechanical sounds, while the FOTRIC and the allsun EM282 list no kit contents beyond the detector itself.
What it will not find
The allsun Pro listing states it is not designed for detecting leaks in water pipes, plumbing, swimming pools or tires. The Vanlison lists water among the systems it covers, so check each listing before pointing any of these at a water line.
Warranty
The FOTRIC lists 12 months, and the allsun Pro and the allsun EM282 each list 1 Year. The Vanlison and the AccuTrak list no warranty term, so read the listing before counting on warranty cover.
Use rated jack stands on solid ground, wear eye protection with power and air tools, keep fuel-burning equipment out of a closed garage, and follow the manual for every tool. Read our Safety Disclaimer.
Garage Fit Check
- Check the frequency range first: the FOTRIC covers 2 to 100 kHz, the allsun EM282 works at 40kHz, and the AccuTrak states an audio output instead of a detection frequency.
- Count the kit pieces: the Vanlison kit holds a scanner, headphones, a case, a 9V battery and a manual, while the AccuTrak kit adds a touch probe and a waveguide.
- Check the size and weight for the toolbox: the Vanlison measures 22.8 x 1.8 x 1.8 inches at 0.7 pounds, and the AccuTrak case measures 17 x 7 x 14 inches.
- Confirm the warranty term: the FOTRIC lists 12 months and the 2 allsun detectors list 1 Year, while the Vanlison and the AccuTrak list none.
FAQ: garage tools
What is an ultrasonic leak detector?
It is a tool that listens for the high-frequency sound escaping gas or air makes and turns it into a signal a mechanic can follow. The FOTRIC shows the sound as a color soundmap on a screen, while the Vanlison, allsun Pro and AccuTrak use headphones, LED lights or a bar graph.
How does an ultrasonic leak detector work?
Gas or air forced through a small opening creates turbulence, and that turbulence makes ultrasonic sound. The detector picks up that sound: the Vanlison uses 38 to 42kHz waves, the allsun EM282 uses a 40kHz sensor, and the FOTRIC captures sound from 2 to 100 kHz with a 64+ microphone array.
How well do ultrasonic leak detectors work?
The listings describe pinpoint results: the FOTRIC claims cm-level accuracy from a 64+ microphone array, and the Vanlison claims to pinpoint microscopic leaks. The allsun Pro adds a contact probe for listening to bearings, valves and pumps, so the tool also checks mechanical sounds.
Can an ultrasonic leak detector find a water leak?
It depends on the listing. The allsun Pro states it is not designed for detecting leaks in water pipes, plumbing, swimming pools or tires. The Vanlison lists water among the systems it covers, so check the listing for the detector in hand.
What is the difference between passive and active modes?
The allsun EM282 supports passive ultrasonic detection for pressurized systems and an active mode when paired with an ultrasonic signal transmitter for sealed container checks, HVAC inspection and automotive leak diagnosis. The other listings describe passive detection only, so the active mode is an EM282-only feature.
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