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Alex wrote:

"In addition to my previous message,
believe me or not, but my Casio fx250D worked on its original battery
from 1989 to 2004. I actually thought it is solar-powered"

 

The fx250/260 series are the best non-programmable "trig" calculators ever manufactured (in my opinion!). They do just what we need them to, they do it right, and they are now dirt cheap. I've got three of them within twenty feet of me right now because they're such a great value.

 

You mentioned the sexagesimal (deg, min, sec) input function earlier. I was amazed to discover when I bought an fx-260 solar-powered model last fall that this function has been refined even more. Whereas earlier versions displayed the angle always as decimal degrees, this newer model shows deg, min, sec separately which makes typos much more obvious. It also does inverse conversions when you want to get deg,min,sec from decimal degrees. These are trivial matters in any expensive computing device, but it's just amazing to see it in a calculator that costs less than eight dollars.