It seems to be working ok (haven't calibrated it, don't know if it's even possible), but it needs 9v batteries to operate. I have no intention to spend money on new batteries when ever it runs out of juice, so here's a simple hack to stop using batteries. I added an external connection to run it off an AC adapter:
This is the internal connector, from the AC adapter to the original 9v battery connector. I kept the original connector as stock, should the need ever arise to use batteries again:
Already had this philips AC adapter lying around, so I put it to good use:
(Last picture showing the multimeter measuring a -0.006v of the room air, don't know why...)
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