I've used HP test gear all of my life (I'm 65), and now have a pretty well-equipped electronics lab at home with probably half HP and half everything else.? I also have some older HP computer gear, including HP 85A and 87XM computers I use to control the test gear with, and an HP 2100A that I'm restoring.
I use this gear professionally to design "widgets" that I sell to various customers - primarily industrial, but also some laboratories.? I also build boutique musical equipment and hope to introduce a product into that market next year.? Along the way I restore and maintain my older audio equipment.
Right now I'm searching for a battery for an HP 970A probe multi-meter.? It doesn't matter if it works (it almost surely wont); I want to measure the case, then 3D-print a drop-in replacement using modern lithium batteries.? I'm hoping that I can beg, borrow, trade, or buy one for that purpose.
