Those who attend high school and college, especially those doing science, would agree that most of their daily work involves complex calculatons that cannot be done manually. Hence a calculator is required, not just an ordinary calculator but a scientific calculator.
The above need made me choose the 570MS scientific calculator by Casio. Costing only $15, this calculator is jam-packed with features. The first feature you will notice is it's ability to solve equations. Be it linear, simultaneous, quadratic and cubic equations as well as integration and differentiation, this calculator solves them all within a few seconds. It is also capable of storing data for statistical and regressional mathematics. It even supports complex calculations that are usually done at university level.
Matrix and vector calculations are also possible with this calculator. It comes with a conversion table and a list popular constants pre-programmed into the calculator with the instructions on the back of the calculator's cover. A list of common powers from f-T are also included. This is what sets this calculator apart from other calculators of similar prices.
The battery used by this calculator is a LR44 type. Very powerful and long lasting, a single battery can be used to operate this power literally for a year. Although it lacks solar capabilites in the event of the battery running out, the battery consumption itself is very low so no worries about sudden power failure. It is extremely durable and has endured literally hundreds of falls. An excellent calculator every student should have.