Life span of an HP Calculator

[KF6GPE]

I’m using my dad’s HP-42S, which he bought the year it came out, on the original batteries. Granted that it didn’t get a lot of use once he retired until I inherited it, but I’m still quite pleased by that.

My vintage HP-16C (bought on the auction site, I couldn’t afford one when it came out) still looks pretty much brand new, although I use my DM16L more than it because I don’t want to risk dinging it up.

Dad’s HP-67 is much the worse for wear, but it wasn’t treated well for a long time. I keep thinking that I should find a home for it for someone that will bring it back to its former glory.