I've been in the automotive industry for over 30 years, I've never seen these things work very well. Until this thing came along. The only reason I bought it was because our store didn't have a leak detector at all, so you must have some. So I was really expecting a lot, but I was surprised when he found the first rusty battery and I've been making money from it ever since. If you run AC this is a must - I've never seen a sniffer work so well, I've used it on the 134A so far but it says it will work with new stuff. There's no doubt, so far it hasn't let me down - I've been using it for 6 weeks. 7 or 8 air conditioners per week. I'm the only one getting tickets NOW because I don't have comebacks
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