12-digit calculator with an extra-large display features a 300-step check function to automatically review your calculations with the press of a button. While reviewing a calculation, you can make changes in values and operators, and re-execute to obtain a new result. The recheck function provides an audible confirmation of errors when checking calculations to ensure you never miss a mistake. If you press an incorrect key when performing a second calculation to check calculation results, a buzzer sounds to alert you of the error. Go-To button allows you to jump immediately to a particular calculation step for fast, simple reviews. Two-way power operates on solar energy when light is sufficient and a battery in low-light conditions to deliver reliable, long-lasting performance in any setting. Desktop calculator also includes function command signs, key rollover, localized number display, markup and more.