It is a calculator where the computation history remains. Because the expression used to calculate remains as a history, it becomes easy to find where to have miscalculated, and to compare two or more numerical results. When a similar calculation is done many times, it is convenient because the numerical value can be recycled from the history. The thing copied onto the clipboard by a long push on the numerical value of the history and the result can be done. You can change to display of the comma from menu. The advertisement is not displayed in a pay version. - It operates since Android1.6. - It is a confirmed operation by N-04C,GalaxyTab,SH-12C.