Here is one from ebay I'm thinking about ordering-
http://cgi.ebay.com/Freon-CFC-HFC-Halogen-Gas-Refrigerant-Leak-Detector-W0A_W0QQitemZ270442884555QQcmdZViewItemQQptZLH_DefaultDomain_0?hash=item3ef7a6edcb&_trksid=p3286.c0.m14

And the Harbor Freight version-
http://www.harborfreight.com/cpi/ctaf/displayitem.taf?Itemnumber=92514


If I want it today I'll go buy the HF, but I think I'll save $30 and order the one from ebay as I'm not driving too much right now anyways.

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2009 ML320 Bluetec
1985 300CD
1981 300TD

Past Mercedes
1979 300TD
1982 300TD
2000 E320 4Matic Wagon
1998 E430
1984 300SD
1980 300SD