10 Best Hvac Leak Detector of December 2025

• Freon leak detector triggers on R22, R134A, R404a, R410A and all halogenated refrigerants including HFCs, CFCs,HCFCs and blends.
• Response within 3 seconds; Warm up in 6 seconds.
• 7 Adjustable Sensitivity; Maximum sensitivity is 0.21oz/yr.
• Audible and visual gas leakage indicators and dual battery indicator.
• A flexible probe around 7.9-inch allow detections in difficult and hard-to-reach areas. 24/7 US Technician Support via Email and Phone.

Elitech

• 【Upgraded Leak Detector】Upgraded circuit, low-consumption, compact size, easy to hold and carry.
• 【Fast Response】With auto calibration, it warms up in 6s and responds in 3s when leakage detected and flashes leakage level indicator light.
• 【Adjustable Sensitivity】7 Grade sensitivity with maximum sensitivity 0.11oz/yr., suitable for all kinds of leak detections.
• 【Replaceable Battery】 2AA Batteries needed (not included in the package) to power on and equips with a tri-color indicator light to display battery level.
• 【Safe and Reliable】Meets EN14624 and SAE-1627 industrial standards, and responds to R11, R22, R134A, R404a, R410A and all halogenated refrigerants including HFCs, CFCs, HCFCs and blends. 24/7 US Technician Support via Email and Phone.

Elitech

• Detection range: Approximately 50 to 10,000 ppm* (*based on Methane)
• Two levels of sensitivity: High (Approximately 50 to 1000 ppm) and Low (Approximately 1,000 to 10,000 ppm)
• Five red LED's (visual) and 85dB audible alerts that increase with gas concentration
• Automatic zero-point calibration at power-up (lights will flash during self-calibration; this does not indicate the presence of gas)
• 18-Inch flexible gooseneck expands sensor's reach; clips onto meter for storage

Klein Tools

• With the latest and most innovated infrared sensor, its sensor life extends enormously for a maximum of 10 years. It triggers on all halogenated refrigerants much more precisely than traditional corona sensor and moderate heat-diode sensors.
• 3 Selectable Sensitivity Levels -High/Medium/Low; With a maximum sensitivity up to 0.14oz/yr.
• The world's first TFT screen advanced leak detector animates leakage, sensitivity, battery levels and sensor faulty indicators and presents more clear and easy readings.
• Pressing PEAK button to mark the maximum leakage value during measurements.
• Responds to all kinds of halogenated refrigerants and meets EN14624,SAE-162,SAE-2791 and SAE-2913 standards.【Free return or exchange within 3 months!】 24/7 US Technician Support via Email and Phone.

Elitech

• Traditional coronal sensor with upgraded low-energy CPU, more stable and fast triggers on R11, R22, R134A, R404a, R410A and all halogenated refrigerants including HFCs, CFCs,HCFCs and blends.
• Response in 3 seconds; Warm up in 6 seconds.
• 7 Adjustable Sensitivity with max. sensitivity of 0.11oz/yr.
• 14 inches flexible stainless steel probe with 3 extra sensing tips
• Modular sensor,convenient for maintenance.Powered by: 2 C Alkaline batteries(included). 24/7 US Technician Support via Email and Phone.

Elitech

• Sensitivity :6g/year
• Response within 1 second; Warm up in 6 seconds.
• Sensitivity adjusted at any time and it can be adjusted automatically to the best state of detecting
• Certificate & Approval:CE Rohs, SAE J2791, SAE J2913
• Audible and visual gas leakage indicators and dual battery indicator.

Wale&Morn

• It is the newest and most advanced leak locator formula
• It detects leaks of refrigerant gases, air, oxygen, and most other gases
• Its thick formula can be used at various temperature and pressure applications
• It is biodegradable
• It will not corrode metal surfaces or attack plastic or rubber

Rectorseal

• Cal Blue(R) Plus, Noncorrosive, Oxygen-Safe, Liquid Spray Bottle
• Cal-Blue Plus has outstanding freeze-protection down to 5F
• Cal-Blue products are the complete gas leak detector
• Model number: 4182-24

NU-Calgon

• Triggers on all CFCs, HFCs, HCFCs and blends. More sensitive to some refrigerants than others.
• 15-hour rechargeable, user replaceable battery. It lasts almost two full workdays on a single charge (if your hunting down leaks all day). You can also use it while it's hooked up to the wall or vehicle charger.
• Filter system helps protect the sensor from moisture and other contaminants. The sensor is connected to the body at the other end of the snout. The filter is at the tip of the snout. If you accidentally hit some condensation or oil, the filter swells, shutting off the pull to the sensor and protecting it from failure.
• Manual or automatic zeroing. It auto zeros every two seconds until a leak triggers the sensor. After that you can manually zero the detector to help further pinpoint leaks.
• Up and running in 30 seconds. Some heated elements and corona discharge units take much more time to warm up. UV dyes can take several hours to travel through a running system and can degrade system components.

Fieldpiece

• Robinair's Halogenated Refrigerant Leak Detector makes finding refrigerant leaks fast and easy
• Innovative Microprocessor Controlled Circuitry and Advanced Digital Signal Processing monitor the sensing tip up to 2K times/second
• Completely re-designed sensing tip - on a 14 inch long (35.5 cm) flexible stainless steel probe with liner - increases sensitivity, improves reliability, and lasts twice as long as it's predecessor
• Features: variable frequency audible alarm, constant power indication, cordless, battery powered operation on 2 C-cell batteries, and carrying case
• Certified to SAE J1627 standards with CE approval and UL classification

Robinair