High School relief!

I am currently doing a diploma in technical education where Math and formulas play an important role.
My old calculator had complicated and opaque input methods - in contrast to Casio. I am absolutely thrilled by this calculator, all bills go much faster by hand and can be understood very easy and check for any typos.

Single (not important) drawback this is not specified by the seller, the calculator is English.
But that makes that device ansich no worse piece and is for anyone to use.

Wants to save quite strong buy recommendation for each of the time, energy and nerves!