Scientific Calculator- Citizen

Scientific Calculator is a powerful Android scientific calculator with real look. It is one of the few Android calculators with complex number equations support. Features:
Scientific Calculator For Citizen includes the following features:
1 Traditional algebraic or RPN operation
2 Unit conversions
3 Physical constants table
4 Percentages
5 Result history
6 10 memories
7 Binary, octal, and hexadecimal (can be enabled in Settings)
8 Trig functions in degrees, radians or grads
9 Scientific, engineering and fixed-point display modes
10 7-segment, dot-matrix or standard font display
11 Configurable digit grouping and decimal point
12 External keyboard support
13 Full built-in help

Scientific Calculator For Citizen has free caller ID. It identifies callers for you - even the ones not in your contact list. Caller ID results are shown after calls and also allow you to save the contact details directly to your address-book.