Hey kage,
well I personally had to face the same situation when I explored that there were hundereds of those nice little meters...
Maybe you ahould have classified a bit more what you want that thing to do. There are too many to just give an example of which one to buy. They range from cheap to expensive, small to huge and so on.
Since I 'm from Germany, I got a German one. Maybe you should check them out here:
http://www.industrial-needs.com/meas...ity-meters.htm
That's where I got mine and they offer lots of that stuff.