A friend had a central AC problem where the system was not cooling properly. An AC man came and added refrigerant to the system and was asked for an evaluation of any leaks. The guy said it would be $250 to do a "sniffer" search on the unit - just one of two units! We declined, the system never really cooled like it should and fortunately with a second visit by someone else, the problem was resolved without the detection of a leak. That is when I purchased this leak detector and was naturally skeptical about its efficacy (because it was so inexpensive) but figured something was better than nothing. My opportunity came along sooner than I would have expected when the older AC unit on my tenant's house froze over. I thawed it out and used this tool to "sniff" for any leaks. I got a detection in the rear of the inside condenser and since it was not holding refrigerant, I had to call a professional. He confirmed that I had indeed found the correct location of the leak. He went further to tell me that this was a solid device that I could trust in spite of its low cost. Just keep it clean and remove the batteries for storage.Read full review
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