• Ideal scientific calculator FX-991 Es plus 2nd edition is perfect for Engineering, polytechnic and science students • Natural Text Book Display Natural text book displays text as written in a text book. This feature makes number reading easy and fast • Design Highly visible, easy-to-press cursor keys and function keys • Two-way attachable Hard case Hard case that's attachable and detachable in both the directions • Number of Functions : 417 Support Statistic Trigonometry, permutation & combination, logarithmic, integration, differential, simultaneous & polynomial equation, vector, matrix, complex numbers, Base-n calculations and many more