The Casio fx-991ES Scientific Calculator is probably one of the most owned calculators among engineering students nowadays because of its user friendly LCD interface, has multiple functions and is easy to use. One of its useful functions is its ready to use scientific constants that can be used in different computations. This eliminates the hassle of entering the whole constant which is actually hard to memorize in the first place. However, there are 40 scientific constants in the model including proton, electron and neutron masses, Planck's constant, Rydberg's constant, permittivity of free space, gravitational acceleration, characteristic impedance etc. All 40 of them are referenced in the slide case of the calculator and are only represented by their symbols, and the problem is, you are not yet familiar with most of these constants so accessing them one-by-one by showing their equivalent values can be a waste of time. But FREE-ECE has a solution to that. Here's a special edition FREE-ECE PDF copy of Casio fx-991ES (also for ES Plus) scientific constants list (all 40 constants) including their constant number (the one that you will input after pressing the 'SHIFT' button), constant name, constant symbol and the constant's value (according to the calculator's memory) The download link is at the bottom of the photo. Enjoy!

nice! very useful. Thanks for the help!
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