9fingers
Established Member
Steve, I think the problem is that your fibreglass pencil has taken the protective plating off the contacts.
These often have a gold flashing about a tenth of an atom thick and once this is gone the contacts corrode at a microscopic level. The current drawn by the calipers is so low that this does not self clean.
I you have a soldering iron, clean once a gain with your fibreglass pencil and then tin with a little solder only touching the iron on briefly.
hth
Bob
These often have a gold flashing about a tenth of an atom thick and once this is gone the contacts corrode at a microscopic level. The current drawn by the calipers is so low that this does not self clean.
I you have a soldering iron, clean once a gain with your fibreglass pencil and then tin with a little solder only touching the iron on briefly.
hth
Bob