I also have 2 leak detectors. They work great. However that one from Harbor Freight is junk. I compared it side by side with quality instruments two times. The first instrument was so bad we thought it was defective. We exchanged it for another one. Same results. They are junk. Sure it will detect the large leaks like a manifold hose with freon in it. Good GOD it should. But where it really counts is when the leak is small. Like a fraction of a pound of freon per year size leak. Try that with the HF special. It won't see it. I was able to get the HF unit to register a leak by simply breathing on it. Now maybe that says something about my breath. But I think it says something more about the detector itself. Try the "breath test" and see if it responds.

Bottom line is if you are happy with it - thats cool.

Tinfreeh - I am not saying all electronic detectors are junk just the HF ones IMHO.

Just relating my experiences with it just like you asked.

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I got too many cars!! Insurance eats me alive. Dave

78 Corvette Stingray - 3k
82 242 Turbo Volvo - Manual - 270k
86 300e 5 speed manual - 210k
87 420sel - 240k
89 560sl - 78k
91 420sel - 205k
91 560sel - 85k
94 GMC Suburban - 90k
97 Harley Davidson Heritage Softail - 25k
00 GMC Silverado 1 ton 30k