Casio are one of the world's largest manufacturers of pocket calculators. The company was founded in Japan in 1946 (originally called Kashio Seisansho) and has its headquarters in Shibuya, Tokyo. As well as calculators, the company manufacturers a wide range of electronic equipment including electronic musical instruments, cameras and watches. The company was founded by engineer Tadao Kashio ('Casio' is an anglicized version of his name) who invented a cigarette pipe which became the company's first product. The compay then worked on other engineering product manufacturing until his brother Toshio suggested that they develop an electro-mechanical calculator. At the time electric calculators were essentially motorized versions of hand operated devices, but the new calculator was based instead on relay technology used in telephone exchanges. It was launched in 1954 and was the first to be manufatured in Japan. The company moved to electronic designs in 1965 with the launch of its first 'all-transistor' model, with integrated circuits taking over in the late 1960s, although electronic calculators were still large, expensive desktop devices. The first pocket calculators were the various versions of the Casio Mini, using six-digit vacuum fluorescent displays. Although they were just one of many calculator manufacturers in the 1970s, by the 1980s Casio was a technology leader launching the world's first graphing calculator, the Casio fx-7000G. Casio continue to be one of the largest calculator manufacturers, with their scientific models used widely in schools throughout the world.
More information can be found at the Casio corporate website. User Manuals can be found at the manufacturer's site
Product Review for Renata Battery Replacement for Casio FX-115MS Calculator. Long-lasting power for your coin-cell-operated devices such as household electronics like keyless entry systems, e-books, toys, calculators, watches, heart rate and glucose monitors and more; Watch and key fob battery installation services are available in store. Solar & Battery Solar powered when light is sufficient, battery powered when light is insufficient. Plastic keys Designed and engineered for easy operation. (Super Visually Perfect Algebraic Method) All the features of the existing V.P.A.M. Series plus a new 2-line display and a useful Replay function. The battery immediately after display figures become dim. Fx-115ES PLUS/fx-991ES PLUS C: Every 3 years.A dead battery can leak, causing damage to and malfunction of the calculator. Never leave a dead battery in the calculator.The battery that comes with the calculator is for factory testing, and it discharges slightly during shipment and storage. The Casio FX-115ESPlus scientific calculator is the most advanced solar-plus-battery scientific calculator that provides long life and dependability. With its Natural Textbook Display, in addition to advance Statistics, Matrix, and Conversion functionality, the FX-115ESPlus is a perfect choice for high school and college students. Casio FX-115ES PLUS Casio FX-300ES Plus; Battery operated: yes. External power connection: Solar cell: Solar cell: Often compared with Casio FX-115ES PLUS. Suggested Casio FX-991EX Casio FX-991ES Plus Casio FX-991ES Casio FX-570ES Plus Texas Instruments TI-30X IIS Casio FX-83GT Plus Casio FX-570ES Casio FX-115MS Texas.