Casio is a leading Japanese electronics manufacturer known for its durable G-Shock watches, scientific calculators, electronic musical instruments, and labeling systems.
Casio Computer Co., Ltd. is a Japanese multinational electronics manufacturing corporation headquartered in Shibuya, Tokyo. Founded in 1946, Casio established itself as an innovator in digital technology, releasing the world's first all-electric compact calculator in 1957. Today, the brand is synonymous with precision and durability, offering a vast array of consumer electronics suitable for daily life, education, and professional use.
The company's product portfolio includes the iconic G-Shock and Baby-G watch lines, which set the standard for shock resistance, as well as the Edifice and Pro Trek series. Casio is also a dominant force in education with its scientific and graphing calculators, such as the ClassWiz and fx series. Additionally, Casio manufactures electronic musical instruments, including the Privia digital pianos and Casiotone keyboards, alongside label printers and digital cameras.
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You can download PDF manuals for Casio watches by entering the 4-digit module number (found on the back of the watch case) on the official Casio support website or by browsing the Casio category on Manuals.plus.
For many models like the ClassWiz or fx series, press Shift followed by 9 (Reset), then select 'Initialize All' (usually option 3), and confirm with '=' (Yes) and 'AC'. Check your specific model's manual for exact keystrokes.
Typically, hold the top-left 'Adjust' button until the city code flashes. Use the 'Mode' button to cycle through settings (DST, 12/24h, Hour, Minute) and the right-side buttons to adjust the values. Press 'Adjust' again to exit.
'Water Resist' without a depth rating usually means it can withstand splashes or rain. 50M (5 BAR) is suitable for swimming, while 100M (10 BAR) and 200M (20 BAR) are suitable for water sports and diving (excluding scuba).