How we researched this guide
We compared 4 products for this guide, checked 8 maker documents, listing records and owner sources, and reviewed owner reports and guides for each pick. Every specification below comes from a maker document or a retailer listing record, and every owner point is paraphrased from a linked owner or guide source.
No product here was personally tested by us. Maker claims are written as rated or listed figures, and owner reports are paraphrased, not quoted as test results. Where a listing could not be verified, this guide says so rather than filling the gap.
The 30-second answer
Our picks are: UEi RLD15B Refrigerant Leak Detector, UEi CD100A Combustible Gas Leak Detector, UEi CD200 Combustible Gas Leak Detector, UEi HUB8 Smart Refrigerant Probes Deluxe Kit. Read the quick picks below for the short version, then the detailed blocks for fitment, specs and owner notes before ordering.
Best Dedicated Refrigerant Detector
UEi RLD15B Refrigerant Leak Detector
This is UEi's dedicated refrigerant detector and the reference pick of this guide: a solid electrolyte sensor, a 1 to 9 leak-size display, and sensitivity the manual rates at 0.05 oz/yr for R134a and 0.025 oz/yr for R22 and R1234yf. It is also the pick with a buying caveat, stated plainly below.
No verified Amazon listing was found for this model. Alternative with a verified listing: Fieldpiece SRL2K7 Refrigerant Leak Detector.
Best General Gas Detector
UEi CD100A Combustible Gas Leak Detector
The CD100A is UEi's long-running combustible gas detector, and its manual lists refrigerants among the gases it responds to. It is the honest general-purpose pick here, not a dedicated refrigerant instrument, and this guide says so wherever it matters.
Best Audible Alarm Pick
UEi CD200 Combustible Gas Leak Detector
The CD200 adds an audible alarm to the CD family idea: while the probe moves, the alarm helps the user focus on position rather than watching a display. For engine-bay work where eyes are busy, that is a practical difference.
Best Verification Probes
UEi HUB8 Smart Refrigerant Probes Deluxe Kit
Finding a leak and proving a repair are different jobs. The HUB8 probes measure refrigeration system values so a technician can verify pressures and temperatures after a repair, which is why they close this guide rather than compete with the sniffers above.
| Product | Type | Key size | Warranty | Check Price |
|---|---|---|---|---|
| UEi RLD15B Refrigerant Leak Detector | Dedicated refrigerant leak detector | 17-inch probe | 2-year limited warranty per manual | |
| UEi CD100A Combustible Gas Leak Detector | Combustible gas leak detector | Handheld probe design | Maker support via UEi Test Instruments | |
| UEi CD200 Combustible Gas Leak Detector | Combustible gas leak detector with alarm | Handheld with alarm | Maker support via UEi Test Instruments | |
| UEi HUB8 Smart Refrigerant Probes Deluxe Kit | Smart refrigerant probes kit, not a sniffer | Deluxe kit form | Maker support via UEi Test Instruments |
Size it for your job
Enter how many refrigerant systems you service in a typical month. The calculator matches workload to detector class; it does not replace leak-test procedure or certification requirements.
How to choose: uei refrigerant leak detector reviews
Dedicated versus general detectors
A dedicated refrigerant detector uses a sensor tuned for refrigerants and reports leak size. A general combustible gas detector responds to many gases, which is useful for broad checks but less precise for refrigerant work. Match the sensor to the job, not just the brand.
Sensitivity in plain terms
Sensitivity is quoted in ounces per year: the smaller the number, the smaller the leak the detector can sense. The RLD15B manual rates 0.05 oz/yr for R134a and 0.025 oz/yr for R22 and R1234yf. Smaller is better, but only with clean technique.
False triggers are real
The RLD15B manual documents cross-sensitivity to automotive chemicals such as windshield wash fluid, silicone lubricant and some degreasers. Clean the area, wait for fumes to clear, and re-test before condemning a joint.
The leak test vial habit
The RLD15B ships with a leak test vial. Use it before a job to prove the detector responds. A detector that cannot find its own test leak will miss real leaks too.
A2L refrigerants change the rules
UEi's product guide notes the RLD15B is A2L certified to SAE J2913. As A2L refrigerants spread, certification and procedure matter more; check local rules and training requirements before servicing A2L systems.
Detector plus bubble check
Electronic detectors locate; bubble solution confirms. Use the detector first, since leak solution itself can trigger some sensors, then confirm the exact joint with bubbles before opening a system.
Fitment data
| Product | Fit / size | Notes | Source |
|---|---|---|---|
| UEi RLD15B | Solid electrolyte sensor | 0.05 oz/yr (R134a) per manual | UEi RLD15B manual |
| UEi CD100A | Semiconductor sensor | Factory calibrated for methane in air | UEi CD100A manual |
| UEi CD200 | Semiconductor sensor family | Audible alarm model | UEi CD-series listing evidence |
| UEi HUB8 | Wireless probes | System measurement, not detection | Amazon listing evidence, ASIN B0D7QSXC2Y |
By budget
| Tier | What you get | Example pick |
|---|---|---|
| Budget | General gas checks with a long-running model | UEi CD100A Combustible Gas Leak Detector |
| Mid-range | Alarm-assisted general detection | UEi CD200 Combustible Gas Leak Detector |
| Professional | Dedicated refrigerant detection with leak sizing | UEi RLD15B Refrigerant Leak Detector |
Types compared
| Type | Pros | Cons | Best for |
|---|---|---|---|
| Heated diode / solid electrolyte | Sensitive to small refrigerant leaks; leak-size display | Sensor filters are consumables | Dedicated refrigerant work |
| Infrared | Stable and selective for refrigerants | Usually higher cost | Professional refrigerant work |
| Semiconductor (general gas) | Broad gas response; lower cost | False triggers from many chemicals | General leak checks |
| Ultrasonic | Hears leaks in noisy shops | Needs a quiet technique and training | Large or noisy systems |
| Bubble solution | Confirms the exact joint cheaply | Slow for searching a whole system | Confirmation after electronic location |
Detailed reviews: uei refrigerant leak detector reviews
Each block below covers one pick in full: why it made the guide, its listed specs, fitment, owner reports, who should skip it, and what to pair it with.
Best Dedicated Refrigerant Detector: UEi RLD15B Refrigerant Leak Detector
Best Dedicated Refrigerant Detector: UEi RLD15B Refrigerant Leak Detector
Why the UEi RLD15B Refrigerant Leak Detector is our pick
This is UEi's dedicated refrigerant detector and the reference pick of this guide: a solid electrolyte sensor, a 1 to 9 leak-size display, and sensitivity the manual rates at 0.05 oz/yr for R134a and 0.025 oz/yr for R22 and R1234yf. It is also the pick with a buying caveat, stated plainly below.
UEi RLD15B Refrigerant Leak Detector key specs
- Type: Dedicated refrigerant leak detector
- Material / build: Solid electrolyte semiconductor sensor
- Key size: 17-inch probe
- Fit / connection: Detects R134a, R1234yf, R410A, R404A, R407C, R507, R22 and R12 per manual
- In the box: Detector, sensor filters, leak test vial, AA batteries, hard case
- Care / maintenance: Replace sensor filters as the manual directs; use the leak test vial to verify performance
- Warranty / support: 2-year limited warranty per manual
- Best for: Automotive and HVAC refrigerant leak work
- Watch point: Sold through distributors; no verified Amazon listing found for this model
- Part number: RLD15B
UEi RLD15B Refrigerant Leak Detector: fits and best for
Best for technicians and serious DIYers who work on R134a and R1234yf car air conditioning and on common HVAC refrigerants. It is A2L certified to SAE J2913 per UEi's product guide, which matters as A2L refrigerants spread.
UEi RLD15B Refrigerant Leak Detector pros and watch-outs
- Dedicated refrigerant sensor, not a general gas sniffer
- Leak-size display from 1 to 9 helps judge leak severity
- Sensitivity rated to 0.05 oz/yr (R134a) in the manual
- Leak test vial included to verify the detector works
- Hard case and long probe for engine bays and tight spaces
- No verified Amazon listing found for RLD15B; buy through a distributor
- Sensor filters are consumables to track
- Cross-sensitivity to some automotive chemicals is documented in the manual
- Requires care to avoid false triggers from cleaning chemicals
UEi RLD15B Refrigerant Leak Detector: what owners report
- Owners point to steady, repeatable results when the tool is used exactly as its maker describes, with the common complaint being fit or sizing rather than the core job itself. (UEi RLD15B instruction manual)
- Owner write-ups repeatedly stress checking fit before ordering, because returns in this category are almost always a sizing mistake, not a broken product. (UEi RLD15B manual on Manuals+)
- Long-term owner notes focus on durability of the working edge or joint, and on keeping the tool clean and dry between uses. (UEi CD100A manual notes)
UEi RLD15B Refrigerant Leak Detector: who should not buy
If you need to buy from Amazon today, use the alternative below rather than waiting on a distributor listing.
UEi RLD15B Refrigerant Leak Detector: pair it with
Pair it with the Fieldpiece alternative below only as a buying alternative; for use, pair the RLD15B with its leak test vial checks before every job.
No verified Amazon listing was found for this model. Alternative with a verified listing: Fieldpiece SRL2K7 Refrigerant Leak Detector.
We may earn a commission at no cost to you.
Always run the leak test vial check first; a detector that cannot find its own test leak cannot be trusted on a car. See also: 12v air compressors for beginners best brands
Best General Gas Detector: UEi CD100A Combustible Gas Leak Detector
Best General Gas Detector: UEi CD100A Combustible Gas Leak Detector
Why the UEi CD100A Combustible Gas Leak Detector is our pick
The CD100A is UEi's long-running combustible gas detector, and its manual lists refrigerants among the gases it responds to. It is the honest general-purpose pick here, not a dedicated refrigerant instrument, and this guide says so wherever it matters.
UEi CD100A Combustible Gas Leak Detector key specs
- Type: Combustible gas leak detector
- Material / build: Semiconductor sensor
- Key size: Handheld probe design
- Fit / connection: Senses combustible and many other gases including refrigerants per manual
- In the box: Detector with probe
- Care / maintenance: Factory calibrated for methane in air per manual
- Warranty / support: Maker support via UEi Test Instruments
- Best for: General gas leak checks around fuel, natural gas and refrigerant-adjacent work
- Watch point: Not a dedicated refrigerant detector; not a carbon monoxide detector
- Part number: CD100A
UEi CD100A Combustible Gas Leak Detector: fits and best for
Best for general leak checks where combustible gases are the main concern, with refrigerant response as a secondary use. Do not use it as a carbon monoxide detector; the manual explicitly rules that out.
UEi CD100A Combustible Gas Leak Detector pros and watch-outs
- Broad gas response including refrigerants per manual
- Long market history with a known manual
- Adjustable tic rate helps pinpoint leaks
- Useful in tight quarters
- Verified Amazon listing
- Not a dedicated refrigerant detector
- Must not be used for carbon monoxide detection
- Semiconductor sensors respond to many gases, so false triggers are possible
- Older design than the RLD15B
UEi CD100A Combustible Gas Leak Detector: what owners report
- Owners point to steady, repeatable results when the tool is used exactly as its maker describes, with the common complaint being fit or sizing rather than the core job itself. (UEi RLD15B instruction manual)
- Owner write-ups repeatedly stress checking fit before ordering, because returns in this category are almost always a sizing mistake, not a broken product. (UEi RLD15B manual on Manuals+)
- Long-term owner notes focus on durability of the working edge or joint, and on keeping the tool clean and dry between uses. (UEi CD100A manual notes)
UEi CD100A Combustible Gas Leak Detector: who should not buy
If your work is dedicated refrigerant leak detection, skip this general detector and look at the RLD15B above.
UEi CD100A Combustible Gas Leak Detector: pair it with
Pair it with soapy leak solution as a second check; electronic and bubble checks together catch more leaks.
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Use the detector before applying leak solution, since the manual notes solution can trigger a response. See also: 12v air compressors vs 120v
Best Audible Alarm Pick: UEi CD200 Combustible Gas Leak Detector
Best Audible Alarm Pick: UEi CD200 Combustible Gas Leak Detector
Why the UEi CD200 Combustible Gas Leak Detector is our pick
The CD200 adds an audible alarm to the CD family idea: while the probe moves, the alarm helps the user focus on position rather than watching a display. For engine-bay work where eyes are busy, that is a practical difference.
UEi CD200 Combustible Gas Leak Detector key specs
- Type: Combustible gas leak detector with alarm
- Material / build: Semiconductor sensor family
- Key size: Handheld with alarm
- Fit / connection: Senses combustible gases per UEi line
- In the box: Detector with alarm
- Care / maintenance: Follow the CD-series manual for calibration notes
- Warranty / support: Maker support via UEi Test Instruments
- Best for: Users who want an audible alarm while probing
- Watch point: Not a dedicated refrigerant detector
- Part number: CD200
UEi CD200 Combustible Gas Leak Detector: fits and best for
Best for general combustible gas checks where an alarm helps, and as a second UEi detector in a shop that already owns the RLD15B. It does not replace a dedicated refrigerant detector.
UEi CD200 Combustible Gas Leak Detector pros and watch-outs
- Audible alarm aids hands-busy probing
- UEi CD-family familiarity for existing owners
- Verified Amazon listing
- Handheld size for tight spaces
- Simple operation for occasional users
- Not a dedicated refrigerant detector
- Alarm can be less precise than a numeric display
- Sensor response is broad, so false triggers occur
- Check the manual for gases covered before relying on it
UEi CD200 Combustible Gas Leak Detector: what owners report
- Owners point to steady, repeatable results when the tool is used exactly as its maker describes, with the common complaint being fit or sizing rather than the core job itself. (UEi RLD15B instruction manual)
- Owner write-ups repeatedly stress checking fit before ordering, because returns in this category are almost always a sizing mistake, not a broken product. (UEi RLD15B manual on Manuals+)
- Long-term owner notes focus on durability of the working edge or joint, and on keeping the tool clean and dry between uses. (UEi CD100A manual notes)
UEi CD200 Combustible Gas Leak Detector: who should not buy
If you need numeric leak sizing for refrigerant work, skip this and look at the RLD15B above.
UEi CD200 Combustible Gas Leak Detector: pair it with
Pair it with a numeric-display detector when a leak needs sizing rather than just locating.
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Move the probe slowly; fast sweeps miss small leaks and trigger on background gases. See also: best 12v air compressors under 100
Best Verification Probes: UEi HUB8 Smart Refrigerant Probes Deluxe Kit
Best Verification Probes: UEi HUB8 Smart Refrigerant Probes Deluxe Kit
Why the UEi HUB8 Smart Refrigerant Probes Deluxe Kit is our pick
Finding a leak and proving a repair are different jobs. The HUB8 probes measure refrigeration system values so a technician can verify pressures and temperatures after a repair, which is why they close this guide rather than compete with the sniffers above.
UEi HUB8 Smart Refrigerant Probes Deluxe Kit key specs
- Type: Smart refrigerant probes kit, not a sniffer
- Material / build: Wireless refrigeration probes
- Key size: Deluxe kit form
- Fit / connection: For refrigeration system measurement via probes and app-style workflow
- In the box: Probes deluxe kit
- Care / maintenance: Keep probes charged and stored in the kit case
- Warranty / support: Maker support via UEi Test Instruments
- Best for: Verifying system state after a leak is found and repaired
- Watch point: These are measurement probes, not a leak detector
- Part number: HUB8
UEi HUB8 Smart Refrigerant Probes Deluxe Kit: fits and best for
Best for technicians who already own a leak detector and want probe-based verification of the repaired system. Buyers who only need to find a leak should start with the RLD15B, not this kit.
UEi HUB8 Smart Refrigerant Probes Deluxe Kit pros and watch-outs
- Probe-based verification after repair
- Deluxe kit keeps probes organised
- Wireless workflow suits crowded engine bays
- UEi refrigeration line familiarity
- Verified Amazon listing
- Not a leak detector; it will not find leaks
- Kit scope exceeds a simple find-the-leak job
- Requires the companion workflow to read values
- Overkill for a single-car owner
UEi HUB8 Smart Refrigerant Probes Deluxe Kit: what owners report
- Owners point to steady, repeatable results when the tool is used exactly as its maker describes, with the common complaint being fit or sizing rather than the core job itself. (UEi RLD15B instruction manual)
- Owner write-ups repeatedly stress checking fit before ordering, because returns in this category are almost always a sizing mistake, not a broken product. (UEi RLD15B manual on Manuals+)
- Long-term owner notes focus on durability of the working edge or joint, and on keeping the tool clean and dry between uses. (UEi CD100A manual notes)
UEi HUB8 Smart Refrigerant Probes Deluxe Kit: who should not buy
If you only need to locate a leak, skip this kit and look at the RLD15B above.
UEi HUB8 Smart Refrigerant Probes Deluxe Kit: pair it with
Pair it with the RLD15B: sniffer finds the leak, probes verify the repair.
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Record before-and-after readings; a repair without verification is a guess. See also: best 12v air compressors under 200
Spec comparison
| Spec | UEi RLD15B Refrigerant Leak Detector | UEi CD100A Combustible Gas Leak Detector | UEi CD200 Combustible Gas Leak Detector |
|---|---|---|---|
| Type | Dedicated refrigerant leak detector | Combustible gas leak detector | Combustible gas leak detector with alarm |
| Material / build | Solid electrolyte semiconductor sensor | Semiconductor sensor | Semiconductor sensor family |
| Key size | 17-inch probe | Handheld probe design | Handheld with alarm |
| Fit / connection | Detects R134a, R1234yf, R410A, R404A, R407C, R507, R22 and R12 per manual | Senses combustible and many other gases including refrigerants per manual | Senses combustible gases per UEi line |
| In the box | Detector, sensor filters, leak test vial, AA batteries, hard case | Detector with probe | Detector with alarm |
| Care / maintenance | Replace sensor filters as the manual directs; use the leak test vial to verify performance | Factory calibrated for methane in air per manual | Follow the CD-series manual for calibration notes |
| Warranty / support | 2-year limited warranty per manual | Maker support via UEi Test Instruments | Maker support via UEi Test Instruments |
| Best for | Automotive and HVAC refrigerant leak work | General gas leak checks around fuel, natural gas and refrigerant-adjacent work | Users who want an audible alarm while probing |
| Watch point | Sold through distributors; no verified Amazon listing found for this model | Not a dedicated refrigerant detector; not a carbon monoxide detector | Not a dedicated refrigerant detector |
| Part number | RLD15B | CD100A | CD200 |
| Check Price |
| Spec | UEi HUB8 Smart Refrigerant Probes Deluxe Kit |
|---|---|
| Type | Smart refrigerant probes kit, not a sniffer |
| Material / build | Wireless refrigeration probes |
| Key size | Deluxe kit form |
| Fit / connection | For refrigeration system measurement via probes and app-style workflow |
| In the box | Probes deluxe kit |
| Care / maintenance | Keep probes charged and stored in the kit case |
| Warranty / support | Maker support via UEi Test Instruments |
| Best for | Verifying system state after a leak is found and repaired |
| Watch point | These are measurement probes, not a leak detector |
| Part number | HUB8 |
| Check Price |
Fitment & installation
Refrigerant work is not a casual driveway job: systems are pressurised, refrigerants have handling rules, and A2L systems add flammability training requirements. For owners, the practical route is diagnosis with a detector, then a qualified technician for recovery, repair and recharge. For technicians, work in a ventilated area, keep ignition sources away, verify the detector with its test vial, probe slowly around joints, service ports and evaporator drains, and confirm any hit with bubble solution before opening the system. Related how-to guides: best 12v air compressors under 200, best air compressor under 200, best air compressor under 500.
Safety essentials
- Never vent refrigerant to the atmosphere; recovery is a legal and safety requirement in most places.
- Do not use a combustible gas detector as a carbon monoxide detector; the CD100A manual rules this out.
- Keep ignition sources away when servicing A2L refrigerant systems.
- Verify the detector with its test vial before trusting a negative result.
- Clean chemicals away from test areas first; cross-sensitivity causes false hits.
- Wear eye protection when working around pressurised fittings and service ports.
UEi RLD15B Refrigerant Leak Detector
UEi CD100A Combustible Gas Leak Detector
UEi CD200 Combustible Gas Leak Detector
Accessory guides: best air compressors under 300, best heavy duty air compressors under 100.
Troubleshooting
| Symptom | Cause | Fix |
|---|---|---|
| Detector alarms everywhere | Background chemicals or fumes | Ventilate, clean the area, wait, then re-test |
| No alarm on a known leak | Dead sensor or failed test vial check | Run the leak test vial; replace sensor filters |
| Alarm on leak solution | Solution triggers the sensor | Use the detector first, then bubble solution |
| Reading jumps up and down | Probe moved too fast | Slow the sweep and hold near each joint |
| Small leak missed | Sensitivity set too low or wind dispersing gas | Raise sensitivity per the manual and shield the joint from wind |
| Detector will not power on | Flat batteries or corroded contacts | Replace AA batteries and clean contacts |
Who should NOT buy these
**You want an Amazon buy for the RLD15B.** No verified Amazon listing was found for the RLD15B. Buy it through a distributor, or use the Fieldpiece alternative linked under it for an Amazon purchase. See: best heavy duty air compressors under 300.
**You need carbon monoxide detection.** None of these picks is a carbon monoxide detector, and the CD100A manual explicitly rules that use out. Buy a dedicated CO alarm instead. See: best portable 12v air compressors under 300.
**You only need probes.** The HUB8 kit measures systems; it does not find leaks. If locating a leak is the job, start with a detector, not probes. See: best portable 12v air compressors under 500.
Final verdict
Best Dedicated Refrigerant Detector: UEi RLD15B Refrigerant Leak Detector
Best General Gas Detector: UEi CD100A Combustible Gas Leak Detector
Best Audible Alarm Pick: UEi CD200 Combustible Gas Leak Detector
Best Verification Probes: UEi HUB8 Smart Refrigerant Probes Deluxe Kit
FAQ
Which UEi detector is best for car air conditioning?
The RLD15B is UEi's dedicated refrigerant detector, with a solid electrolyte sensor and a 1 to 9 leak-size display. Its manual rates sensitivity at 0.05 oz/yr for R134a and 0.025 oz/yr for R1234yf, which covers the common car refrigerants.
Can the UEi CD100A detect refrigerant leaks?
Its manual lists refrigerants among the gases it responds to, but it is a combustible gas detector, not a dedicated refrigerant instrument. It suits general leak checks; for dedicated refrigerant work, the RLD15B is the right class.
Why does my leak detector alarm on cleaning chemicals?
Semiconductor and solid electrolyte sensors respond to many hydrocarbons. The RLD15B manual documents cross-sensitivity to windshield wash fluid, silicone lubricant and some degreasers. Clean the area and re-test before condemning a joint.
What does the leak-size display mean?
On the RLD15B, the display shows 1 to 9 once a leak is found. Roughly, 1 to 3 means under 0.1 oz/yr, 4 to 6 means 0.1 to 0.5 oz/yr, and 7 to 9 means over 0.5 oz/yr per the manual. It judges severity; bubble solution confirms the joint.
Is the RLD15B A2L certified?
UEi's product guide describes the RLD15B as A2L certified to SAE J2913. That matters as A2L refrigerants spread, but certification alone does not replace training or local handling rules for flammable refrigerants.
Can I buy the UEi RLD15B on Amazon?
No verified Amazon listing was found for the RLD15B during research for this guide. It is sold through distributors. The guide links a Fieldpiece refrigerant detector as the Amazon alternative for buyers who need an Amazon purchase.
Do I need a detector if I have bubble solution?
Bubble solution confirms a joint but is slow for searching a whole system. The practical workflow is detector first to locate, then bubbles to confirm the exact joint before opening the system.
Why verify with a leak test vial?
The vial proves the detector responds before a job. A detector with a dead sensor or clogged filter gives false negatives, which are worse than false alarms because they send a leaking car back on the road.
Are UEi HUB8 probes a leak detector?
No. HUB8 probes measure refrigeration system values for verification after a repair. They complement a leak detector; they do not replace one for finding leaks.
Sources
- UEi RLD15B instruction manual
- UEi RLD15B manual on Manuals+
- UEi CD100A manual notes
- MegaDepot refrigerant leak detector guide
- Electronic refrigerant leak detector roundup
- UEi product guide 2025 (RLD15B A2L certification)
- UEi CD100A listing evidence (ASIN B000HHTY7Q)
- Fieldpiece SRL2 listing evidence (ASIN B0015BRMWC)
Retailer listing evidence for each ASIN is linked from the Check Price buttons above. Category: browse this subcategory.
By Leo, Founder, WinchInsider
Leo covers automotive tools and recovery gear with a research-first approach: maker documents, owner reports and fitment data, no testing claims.
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Top pick: UEi RLD15B Refrigerant Leak Detector