Check and correct standard series Calculator
have 10 digits ,and 12 digits, function is : go to, memory, correct, make up, GT memory, percentage, back space, square root, 100 or 120, 150 steps check, review and auto review, double or triple zero, rounding selector, automatic rounding-off. When you entry the wrong number, press back space key to help you back to last step. Semi desktop Office Calculator
with check and correct functions, screen angle suitable for eyesight, large display let digit number easy to read whether sitting or standing and will let your work more efficiently. some desktop calculator has M+,M-,MCR function, those three memory button store input data, you don't need to write down numbers to remember them, it could display automatic.