DC (and AC) amp probe / meter.
 

http://i46.photobucket.com/albums/f1...r/DCAprobe.jpg

Found this at Sears today. Not too costly. Model 82369
http://www.sears.com/shc/s/p_10153_12605_03482369000P

I like it. Makes it easier to get a good idea of what individual PV panels are doing,
without the fuss of a hardwired Amp meter. And, it makes the job of checking current a lot safer too..

This will be perfect for building improvised amp meter shunts for analog meter movements.