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New Casio G-Shock Master of G watches with step counter and solar charging launched in the US

From top to bottom, the Casio G-Shock Gravitymaster GRB300RY-1A9, Mudman GW9500MRY-1A9, and the Rangeman GPRH1000RY-1A9. (Image source: Casio)
From top to bottom, the Casio G-Shock Gravitymaster GRB300RY-1A9, Mudman GW9500MRY-1A9, and the Rangeman GPRH1000RY-1A9. (Image source: Casio)
Casio’s Master of G series, including new Rangeman, Mudman, and Gravitymaster models, is now available in the US. The lineup, previously launched in Japan, features GPS tracking, sensor tech, and solar charging. Starts at $300.

Casio’s Master of G series, which was previously launched in Japan, is now available for purchase in the US. The lineup includes the Gravitymaster GRB300RY-1A9, Mudman GW9500MRY-1A9, and Rangeman GPRH1000RY-1A9. All three models feature a bold yellow/black color scheme and are designed for use in somewhat extreme environments.

The Gravitymaster GRB300RY-1A9 is built with aviation-focused features, including Bluetooth connectivity, a dual-time display, and solar charging. The Carbon Core Guard structure cuts down on weight while not sacrificing on durability. The watch also has an LED backlight for added visibility in low-light conditions.

The Mudman GW9500MRY-1A9 is equipped with Triple Sensor technology, which includes an altimeter, barometer, and compass. It also features radio-controlled timekeeping, a dual-layer LCD display, and mud-resistant construction. The solar-powered system allows for extended use without battery replacements.

The Rangeman GPRH1000RY-1A9 has the most features of the three. It comes with GPS tracking, a heart rate monitor, and VO2 max measurement. The six-sensor system measures altitude, air pressure, acceleration, and temperature. The MIP LCD display distinguishes this model from the rest of the lot, and the solar-assisted charging (just like the Mudman model) should be great for battery life.

The watches are now available in the US through Casio’s official website (links below) and select retailers. The Gravitymaster GRB300RY-1A9 is the cheapest out of the three, priced at $300, while the Mudman GW9500MRY-1A9 costs $400. As expected, the Rangeman GPRH1000RY-1A9 is the most expensive watch in the lineup at $500.

Buy the Casio Gravitymaster GRB300-1A on Amazon.

The Casio G-Shock Gravitymaster GRB300RY-1A9 has dual-time display and solar charging. (Image source: Casio)
The Casio G-Shock Gravitymaster GRB300RY-1A9 has dual-time display and solar charging. (Image source: Casio)
The Casio G-Shock Mudman GW9500MRY-1A9 has an altimeter, barometer, and compass as a part of its Triple Sensor tech. (Image source: Casio)
The Casio G-Shock Mudman GW9500MRY-1A9 has an altimeter, barometer, and compass as a part of its Triple Sensor tech. (Image source: Casio)
The Casio G-Shock Rangeman GPRH1000RY-1A9 is the only watch in the lineup with a step counter. (Image source: Casio)
The Casio G-Shock Rangeman GPRH1000RY-1A9 is the only watch in the lineup with a step counter. (Image source: Casio)

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> Expert Reviews and News on Laptops, Smartphones and Tech Innovations > News > News Archive > Newsarchive 2025 03 > New Casio G-Shock Master of G watches with step counter and solar charging launched in the US
Anubhav Sharma, 2025-03-11 (Update: 2025-03-11)