How to Test/Check/Hack Casio Scientific Calculator fx-991MS, fx-991ES (Calculator Trick!).

Basically engineering students need a Good quality Scientific Calculator for Problem Solving.Now-a-days several duplicate and local companies calculator are available in the market with low prize and impressive outlook for sales. But they didn't care about battery cell backup , button quality and more features such as software also.

Here are some steps to check whether the calculator software is original,

Follow Steps:

1. Step : Press and hold Following Three buttons at same time




➳Shift button
➳Number7 button
ONbutton.

➳Now in the display screen, you should see all options or all pixels are ON.







2. Step : Then press Shift button continuously till Number 1 appears on the screen.





3. Step: Now press all the buttons in the calculator starting fromAlpha button sequentially, except  for the ON button..





4. Step: After pressing all buttons,

➳finally press =
➳then it should show 44 Ok .
➳If it shows, 44 OK' then the calculator is good for your Engineering Mathematics..

If u Confuse or not understood please watch this video given current below:

Basically CASIO is a Good brand for Calculators...
Enjoy Calculating :-)