We've just started playing with Microcontrollers, so decided it was time to invest in a better voltmeter than the ageing analogue one in the garage.
We wanted something that might work with GNU/Linux and it had to be from Maplin to cut down on postage costs. We settled on this one - a Maplin Precision Gold N56FU.
Anyway, it plays nicely with GNU/Linux and the excellent qtdmm. Fantastic reverse engineering site here.
Download the qtdmm.ini file here - the only thing required to make this work is a quick:
$ sudo chmod a+r /dev/ttyUSB0
$ qtdmm &
Load the qtdmm.ini and it all should work.