The display on Mary’s favorite little calculator (remember calculators?) faded away and, of course, this appeared when I popped the back:

A touch of vinegar, some scrubbing, and new cells restored it to good health.
That was easy …
The Smell of Molten Projects in the Morning
Ed Nisley's Blog: shop notes, electronics, firmware, machinery, 3D printing, and curiosities
The display on Mary’s favorite little calculator (remember calculators?) faded away and, of course, this appeared when I popped the back:
A touch of vinegar, some scrubbing, and new cells restored it to good health.
That was easy …