Earning or gaining wealth is not the last word. An appropriate calculation is necessary to maintain them in a sustain state. Calculator has been proved to do this work repeatedly over years. From the simplest to the complex calculation, the calculator can do the task easily and perfectly. Now a day, the calculator is one of the cheapest educational accessories.
The price might rarely pass the budget of $200. But the calculators from the beginning have a greater value of more than $1000. Those calculators are infrequently available today. Actually they become the collectors’ choice. A list is provided as follows considered the most expensive calculators –