Water Leak Detectors
Best Oil Leak Detector (2026): Top 5 by the Specs
As an Amazon Associate we earn from qualifying purchases. Specs below come from each product's Amazon listing; we do not test products in person.
For an oil leak detector, look at the UV dye kits in this list: the Vansky kit inspects oil and fluid leaks with UV light and glasses, while the Lichamp and COSOOS kits inspect oil dye traces. The YoLink sensor detects water leaks and the Inficon detects refrigerant, so match the detector type to the leak you hunt.
Starting out? See the main guide: Best Water Leak Detector
Top picks at a glance
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Best OverallYoLink Water Leak Sensor9.8 View on Amazon -
9.3 View on Amazon -
9.3 View on Amazon -
Also GreatLichamp AC Leak Detector Kit Automotive9.2 View on Amazon -
9.2 View on Amazon
Compare the specs
Ranked on alarm volume, phone app control, battery powered, pack size from each listing, plus how many buyers have rated it. A dash (—) means we could not confirm that figure from the listing.
| Pick | Alarm volume | Phone app control | Battery powered | Pack size | Weight | Warranty |
|---|---|---|---|---|---|---|
| 1. YoLink Water Leak Sensor | 105 dB | Yes | Yes | 3-pack | — | — |
| 2. Inficon Inficon Refrigerant Leak Detector | — | — | Yes | — | — | — |
| 3. Vansky Air Conditioner Leak Detector: Professional Car | — | — | Yes | — | — | 1-year |
| 4. Lichamp AC Leak Detector Kit Automotive | — | — | Yes | — | — | — |
| 5. COSOOS Air Conditioner Leak Detector Tool | — | — | Yes | — | — | — |
YoLink Water Leak Sensor
It pairs a 105 dB alarm with LoRa range up to 2,034 feet and app alerts for water leaks and freeze warnings.
- Alarm volume: 105 dB
- Phone app control
- Battery powered
- Pack size: 3-pack
Good for
- Buyers who want water leak alerts by app
- Buyers who want a 105 dB alarm
Skip it if
- You want an alarm louder than 105 dB
- You want range beyond 2,034 feet
The LoRa protocol reaches up to 2,034 feet in open air, and the sensor sounds a 105 dB alarm on leaks. A low temperature sensor adds freeze warnings, and two AAA batteries run over 5 years. A YoLink hub is required for full app function and is sold separately.
Inficon Inficon Refrigerant Leak Detector
It pairs a heated diode sensor with A2L certification for refrigerant gases and automatic background adjustment.
- Battery powered
Good for
- Buyers who want refrigerant leak detection
- Buyers who want a heated diode sensor
Skip it if
- You want a water leak sensor
- You want sensor life beyond 100 hours
The heated diode sensor detects CFCs, HCFCs, HFCs and HFOs, with A2L certification and automatic background adjustment. Sensor life is 100 hours, and a rugged carrying case is included. The unit runs on battery power for handheld leak checking.
Vansky Air Conditioner Leak Detector: Professional Car
It pairs 68 LEDs with yellow-filter glasses for oil and fluid leak inspection in garages and workshops.
- Battery powered
- 1-year warranty stated
Good for
- Buyers who want 68 LEDs for UV inspection
- Buyers who want protective glasses included
Skip it if
- You want more than 68 LEDs
- You want fluorescent dye included
The 68 LEDs illuminate fluorescent traces for oil and fluid leak inspection, with yellow-filter glasses for clearer viewing. The aluminum body has a textured, non-slip grip at 7.1 by 3.7 by 2.8 inches and 9.9 ounces. The box includes the flashlight, glasses and a manual, with a 1-year warranty. Fluorescent dye is not included.
Lichamp AC Leak Detector Kit Automotive
It pairs 100 LEDs at 385 to 395 nm with protective glasses and IP44 protection for UV inspection.
- Battery powered
Good for
- Buyers who want 100 LEDs for UV inspection
- Buyers who want up to 20 hours of light
Skip it if
- You want more than 100 LEDs
- You want light beyond 20 hours
The 100 LEDs run at 385 to 395 nm for UV inspection, with protective glasses for clearer viewing. Light runs up to 20 hours on 6 AA batteries, which are not included. The aluminum body has an IP44 rating with a non-slip textured grip and lanyard.
COSOOS Air Conditioner Leak Detector Tool
It pairs 21 LEDs with yellow-filter glasses and a portable bag for compact UV dye inspection.
- Battery powered
Good for
- Buyers who want 21 LEDs for UV inspection
- Buyers who want a portable bag included
Skip it if
- You want more than 21 LEDs
- You want a light larger than 3.7 inches long
The 21 LEDs inspect UV dye traces, with polycarbonate yellow-filter glasses for clearer viewing in dark settings. The aluminum tool measures 3.7 by 1.2 by 1.2 inches and comes with a portable bag. Batteries are not included.
How to choose
Match the detector type
Detector type decides what you find: the Vansky kit inspects dye traces for oil and fluid leaks with UV light, while the Lichamp and COSOOS kits inspect oil dye traces. The other two picks cover different leaks: one detects water leaks with freeze warnings and one detects refrigerant gases. Match the detector type to the leak you hunt, since each type covers a different leak.
UV dye kit parts
A UV kit pairs a flashlight with glasses: the Vansky gives 68 LEDs, the Lichamp gives 100 LEDs at 385 to 395 nm, and the COSOOS gives 21 LEDs. All three kits include protective glasses. The Vansky kit does not include fluorescent dye.
Alarms and power
Alerts differ: the YoLink sounds a 105 dB alarm and sends app alerts through a hub, while the Inficon gives an audible alarm for refrigerant. Power differs too: the YoLink runs over 5 years on 2 AAA batteries, the Lichamp runs up to 20 hours on 6 AA batteries, the Vansky runs on AA batteries, and the COSOOS batteries are not included. Check alarm type and battery needs before you buy.
FAQ
Which pick detects oil leaks?
The Vansky kit inspects oil and fluid leaks with UV light, while the Lichamp and COSOOS kits inspect oil dye traces. The YoLink detects water leaks and the Inficon detects refrigerant.
Do I need a hub for the YoLink sensor?
Yes: a YoLink hub is required for full app function, and the hub is sold separately. The sensor still sounds its 105 dB alarm on leaks.
What does the Inficon detector find?
It detects refrigerant gases including CFCs, HCFCs, HFCs and HFOs, with a heated diode sensor and automatic background adjustment.
Do the UV kits include glasses and dye?
All three UV kits include protective glasses. The Vansky kit does not include fluorescent dye, so check dye separately before inspection.
