Still working

As a student engineer in 1980 I purchased a new calculator. From memory it cost about $150 an expensive purchase for me then.

It was designed to fit a shirt pocket - an engineers tool. It uses reverse polish logic to minimise keystrokes; it can do calculations with complex numbers and matrices and is programmable.

I used all through my student years and then my career. I really enjoy using it. It is technology that was built to last. Of course it is made from plastic. It will last as long as batteries are available for it.