From a certain point of view, the generalized Customizable calculator includes an "electronic calculator". There are also integrated circuits in electronic calculators, but the functions of the Customizable calculator are simple, the price is cheaper, and it is convenient for portability and good stability.

In the past, numerical calculations such as the abacus, Napier bones, mathematical table books, engineering slide rules, or mechanical adding machines played an auxiliary role. The term Customizable calculator originally refers to professionals who run mathematical calculations with pen and paper, semi-manual calculations that are laborious and error-prone.
Modern Customizable calculators are powered by electricity and come in many shapes and sizes from cheap, credit card-sized simple devices to special calculators with printing capabilities.
Origin development. A customizable calculator is the earliest calculation tool, for example, Quipu or khipu is a method of knotting notes in ancient Incas, used to count or record history. It is made of knots of many colors.
Through the above introduction and analysis of What is a Customizable calculator, hope it helps you.