Calculator watch Calculator watch A calculator watch is a digital watch with a built in calculator, usually including buttons on the watch face. Calculator watches were first introduced in the 1970s and continue to be produced, despite falling from their peak popularity during the 1980s. The most notable brand is the Casio Databank series, though watches made by Timex were also popular. Most calculator watches contain only a few number of functions such as +, -, x, / and percents. However, there are several models with additional functions: scientific, including transcendent and trigonometry, in models Casio CFX-200, CFX-400, Citizen 49-9421, and also
Sumlock ANITA calculator and took on Kitz as the leader of a project to develop an electronic version of the company's mechanical calculators. To help confidentiality the project was given the code-name ANITA. Since the company had production lines capable of manufacturing precision mechanical parts by the thousand, the first experimental models were mechanical and electronic hybrids. However, these proved impractical and a purely electronic design was pursued. Being the first in the field there were several major technical areas that required considerable development: However, the main constraint was to be the cost of the calculator. The cheapest electronic computer then cost approximately