Picked one up at Harbor Freight for $59. I can't imagine how many times I have needed/wanted one, when the UV dye trick didn't work so well. Of course, at this point in time, I don't actually NEED it. But I'm sure the time will come. In particular, I think this thing might be most useful when checking out used cars.

Anyone have any anecdotes to share from using one of these? Any tips?

I can't wait to get home. I'm gonna crack open my manifold gauges just a hair to see what it detects...

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08 W251 R350
97 W210 E320
91 W124 300E
86 W126 560SEL
85 W126 380SE Silver
85 W126 380SE Cranberry
79 W123 250
78 W123 280E
75 W114 280