CLK-Calculator 2005 is the shareware application tool that allows you to perform various calculations like Unit conversions, matrix calculations, complex numbers, vectors handling, function plotting and much more. This skin able calculator allows you to enter data in both algebraic or RPN mode. Its working pattern is very similar to HP series RPN calculators. It allows you to view your last performed operations and results in a very easy way. It allows you to use both basic operations and complex numbers and vectors in equally simple way. This application also provides you with the facility of converting more than 261 units of measurements. This application allows you to use constants from its library. You can solve all types of Matrices, use different formulas, use logical operations and perform many other tasks using this application. This application does not allow you to solve long expressions and complex equations with large values.