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...don't forget my favorite one: GC-MS :)

Haha I haven't use GC in my research life yet. (I am really bad with analytical chemistry..... what makes it as your favorate ? or you work on very volatile molecules?)

I work with rather volatile compounds, the interface between GC and MS is more reliable and robust and you also do not have to refill the eluent every (few) day(s) but just use a big bottle for your carrier gas and then you are happy for a month. :D

Until the helium tank develops a leak you can't track down. Guess what my current lab problem is. ;)

Ouch, that's a pity. :D