Abacus Basic Calculator

This app can perform super fast calculations for education and industrial uses. It is mixing the ancient wisdom and modern digital technology together with 14 columns and have 5 selections:
For Basic system, it comes with integers & 4 decimal places.
For Scientific system it comes with integers, 2 decimal places, and 4 decimal places.
Highlighted features:
1. Continuous calculations(with full version)
2. Can modify data input process.
3. History of operations and results cam be emailed.
4. Sound supported.