If you were disappointed with the calculator which came with your Android phone, this is the app for you. A calculator which acts like a calculator. 4-function, plus memory, square root and percent keys. Works on all phones with Android 2.2 or above. It has 15-digit precision and uses scientific notation for output when necessary. A bonus feature is the ability to record all your working on a log, like an old-fashioned tally roll, which can be emailed to your computer and then printed as desired.