Download Casio G-Shock instruction manuals by model and module number in PDF format. Recent models also have HTML web instructions. For older models not listed here and for other Casio timepiece manuals, visit Casio Support at casio.com to search by module number. The module number is found on the case back cover of the watch.. Casio g shock mudmaster wr20bar manual. The manual G-Shock WR20BAR watch is equipped with analog hands, including a minute and hour hand, for traditional time-telling. Designed to endure extreme conditions, it remains functional in environments ranging from swimming pools to deserts, and in temperatures from -23°C to 60°C.
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