12 Digits, 300 Steps Check and Correct Calculator for Office & Shop
Recheck Function: The recheck function allows confirmation of errors by sound when checking calculations - if the user presses an incorrect key when performing a second calculation to check calculation results, a buzzer sounds to alert the user of the error
On Display Indication of Active Constant (K): Easier technique for repeat Calculation for +, -, ÷, x . Benefits: reduces any chances of manual error in repeat calculations. E.g. Press  [X] [X] (K is shown on screen) to set “Multiply by 2” as constant. Enter, 10, and keep pressing [=] to get 20, 40, 80, and so on.
Dedicated Tax keys for calculation of price plus tax, tax amount, Price less tax.