PocketMatrix

"The Graphic-DMM is a new concept in test equipment that allows a PDA, Notebook, Tablet-PC and all Systems equiped with a CF or PCMCIA slot to be turned into a dual channel Graphic Digital Multimeter with sophisticated analysis capabilities. Smart Analysis software facilitates step-by-step fault investigation with instant display of results and an interactive diagnostic guide. With the Graphic-DMM it is possible to integrate multiple measurement functions into a single hardware and software platform, providing high-level analysis features and a small, lightweight and portable unit."
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Well, I know that this is really no help for me, but I do know that electicians and handymans could think of this as quite handy. Read the full article over at
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If they did somethin glike that, wouldn't it just be easier to just put a screen in the device itself? And I think Wireless is has some lag in it (maybe very little, but still), so that might have to do something with it .

http://www.geocities.com/oxcarz12/DMM/index.html

there is a much cheaper alternative at the site above. The Radio SHack DMM costs $70. I bought mine on sale for $50. And the pocketPC logging software was $10. It's not dual channel, but for data aquisistion in the field, really works well.