Elitech Freon Leak Detector Halogen Refrigerant Gas Leak Detector HVAC Tester AC Sniffer R22 R410A R134A 1234YF, WJL-6000S

Works as described. For testing I took the caps off my car's A/C high and low pressure ports, and this tested detected a slight leak on both. I tested this on 2 cars, same result. So, conclusion is, this detects even very slight leaks.

I ordered this product at the beginning of an auto AC DIY project that went on for months, and didn't get around to actually using it for awhile, but by the time I did, I found that it worked great, and was well worth the price I paid for it. Specifically, it helped me confirm that the valves on both high and low AC service ports were leaking, and that I needed to replace the cores in both valves. It subsequently helped me to confirm that my core replacements worked, and sealed the leaks I was previously detecting.Both the detection and sensitivity functions worked fine for me, and they should for you too, as long as you follow the instructions and don't expect this simple gizmo to perform like some kind of lab grade precision tool. When searching for leaks in unknown locations, the instructions suggest starting with the highest sensitivity level, then gradually decreasing it until you've pinpointed the exact location of the leak. I did the opposite, because I was testing for leakage from two known locations (AC service port valves) ... in other words, I started with the lowest sensitivity, put the tip as close to the valve opening as I could without touching it, and then worked my way up to gauge the severity of the leak.I got a few false alarms in ambient air at the highest sensitivity setting (knob turned until stopped), but wasn't upset about that. Just turned off to clear/reset the internal electronics, started the sequence again at a slightly lower sensitivity setting, and it worked fine. No false alarms when I backed the knob off a little from max rotation, which I see as "normal" for a simple device like this. For example, the control knob just isn't that sophisticated ... it's the same as a combination power/volume control dial on a radio, which probably gets pretty sketchy when it's controlling the "sensitivity" of something as delicate as an electronic gas detecting sensor.This is a BASIC refrigerant leak detector that worked as advertised for me, for a very reasonable cost. Very satisfied.

Inside some pieces started breaking and falling off but still working

I've been struggling to find a tiny leak in my HVAC system. Dye (Twice) with leak sealer failed to seal the leak and it was nowhere to be found for over a month.I decided to take a chance and get this "sniffer" to help locate the leak.Reading the reviews i was a little worried since many people stated it does not work. but after careful research and understanding that the sniffing tip of the unit is ultra-sensitive, I ended up purchasing it anyways thinking i will be very gentle with it.The tool showed up the next day, I put batteries in the unit and activate it and it seemed to perform the initial startup properly. I went to the outside unit (which I already had completely open) and started moving the probe 1/2"-1" from any object but following the copper lines, i went near every soldering point and nothing... I thought for sure the unit is not working.I went back inside and took apart the air handler cover and started following the copper lines and in 5 seconds, the tested start beeping fast as I came close to one of the valves inside the air handler.I then turned the unit off and waited a few seconds to have the air remove any leftover halogen from the tip and started it up again and went in the direction of the same area and again it started beeping.I confirmed that the leak was there by spraying some water with dish soap in it to make bubbles and BINGO!I tightened up that nut and verified with bubbles AND the sniffer that the leak was gone.All in all, the unit performed perfectly when you use it gently and I performed the test multiple times after allowing it to sit unused for a few minutes between tests.

I dunno what to say. I put it into my ac low side service port and it beeps. I put it next to my water pump it also beeped once lol. Water pump isn’t even close to any ac lines or compressor etc. It does detect Freon as my mechanic sprayed Freon near it in the air and it went off but it also gave false positives by my water pump as if it mistook heat or antifreeze smell for Freon. I don’t know if my ac service port is leaking Freon or not now because of the false positives. I’ll keep it as a toy to help diagnose it but it doesn’t seem as accurate as everyone says. I also turned down the sensitivity button and once I got a beep and once I didn’t by the water pump. I’m gong to try it with the engine cold and see if same thing happens.

I have to admit,..I was skeptical... Read the instructions. Installed new batteries and used as directed in the manual. Pinpointed the slow leak I had in my truck AC to a leaking Schrader valve. Replaced valve. Problem solved. Much better accuracy and detection than I expected. For a non- professional application, this unit worked like a charm.

Did not work no light and it did not pick up on Freon.

so far has been good at finding leaks, easy to use