Summary

Back when I was in collage I used a digital logit probe and it was shaped like a pencil. I had ran across this small and cheap digital volt meter on E-Bay this the link
http://www.ebay.com/itm/Mini-DC-0-100V-Red-LED-3-Digital-Display-Voltage-Voltmeter-Panel-Motor-/381375100070?hash=item58cbba34a6:g:dtcAAOSwo8hTmvxX
So I wondered why not put this little guy in the same design as the logit probe, And here is what I came up with. Enjoy !!

Note: For the probe tip I used a small piece of 12 gauge copper wire and for the power I used 18650 nickel metal hydride battery.

Created with Design Spark Mechanical. http://www.rs-online.com/designspark/electronics/eng/page/mechanical

Have a great day! :-)

Robert KB3LNN