A gift from my Calculus teacher upon graduation.
Yes manual included. Sadly the 0 (zero) button no longer works, due to battery corrosion... ☹️
this post was submitted on 27 Apr 2024
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Already been there and basically done that actually, but with rubbing alcohol and a pencil eraser.
If vinegar is used (yes I've done that before as well), then it needs to be followed by a baking soda/water solution to neutralize the acid.
I believe the remaining problem is a corroded via, which connects the layers of the board together.
It's only a 2 layer board, so I might get it fully fixed one of these days. Totally within my skill set, just not high on my priority list..
Humanity went centuries without 0s, you’ll probably be fine!
LMFAO!