Not only does it work where you can't see, it's sensitive enough to detect smaller leaks than you could with soap, even where where you could do it can see only a few cubic millimeters of gas per minute. I tested it for an AC leak in a neighbor's truck that has been leaking for over a year with no new charge, so a very slow leak and he found the leak right away. The basic operation is very simple. The instructions explain some of the subtleties that are important to know if you're going to be using it a lot. as reliable as the halogenated refrigerants it was designed to detect. One year guarantee. Made in Taiwan.
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