The MASTER OF G series, one of G-SHOCK's most durable watches, is available in five different series, depending on the intended use.

The RANGEMAN series is named after "rangers" who work in harsh environments such as dense forests and mountains.

The MUDMASTER series was designed to withstand hard environments such as gravel and sand, and is known as CASIO's toughest series to date.

The FROGMAN watch is a highly trusted by professional divers such as marine salvage teams.

GULFMAN and GULFMASTER are corrosion-resistant and tide-graph-equipped watches designed for use by crew members and harbor workers.

GRAVITY MASTER is a pilot's watch that combines robustness, functionality, readability, and operability.

Casio was founded in 1957 by the four Kashio brothers and initially grew with calculators. Casio boasted a high market share in wristwatches and electronic dictionaries, and in 1972 launched the Casio Mini, the world's first personal calculator.

In 1974, Casiotron, the world's first digital watch with a fully automatic calendar function that even supports leap years, was launched.

In 1995, Casio launched the QV-10, the world's first digital camera with an LCD monitor.

Casio's management philosophy is "Creation and Contribution". Products with new functions help people's lives and advance society. They can also bring enjoyment to many people and become the source of new culture. When a new product becomes popular, a new market is created and a variety of peripheral industries grow up. Through the provision of products and services, we hope to contribute to society from various aspects.

Higashine City, located in the east-central part of Yamagata Prefecture, is a major producer of fruit trees such as cherries and apples, and ranks first among all cities, towns, and villages in Japan in terms of cherry production. Yamagata Casio was established in Higashine City in 1979 as a manufacturing plant for Casio Computer Co. In 1983, Yamagata Casio began its own business, combining the technological expertise it had cultivated through its previous manufacturing activities. The company has built a completely drawing-less production system, including precision molds and plastic molding, and its technological capabilities are recognized around the world.