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Casio's new feature-loaded G-Shock Master of G watches officially released with heart rate monitor and triple sensor tech

From left to right, Casio G-Shock GR-B300RY-1A9, GPR-H1000RY-1A9, and the GW-9500MRY-1A9. (Image source: Casio)
From left to right, Casio G-Shock GR-B300RY-1A9, GPR-H1000RY-1A9, and the GW-9500MRY-1A9. (Image source: Casio)
Casio has finally launched three new highly anticipated G-Shock Master of G watches in Caution Yellow—Gravitymaster, Mudman, and Rangeman. These feature-loaded models come with GPS, multiple sensors, solar charging, and a whole lot of durability.

Nearly a month after their first appearance, Casio has officially launched three new Master of G series watches in a bold 'Caution Yellow' color scheme. The Gravitymaster GR-B300RY-1A9JF, Mudman GW-9500MRY-1A9JF, and Rangeman GPR-H1000RY-1A9JR are now available for purchase in Japan. These watches are specifically built for demanding environments, with a focus on advanced sensors and long-term usability.

Gravitymaster GR-B300RY-1A9JF

Priced at ¥44,550 (~$297), the Gravitymaster is designed for aviation and travel. It features Bluetooth connectivity for time sync, a dual-time display, and solar charging for minimal battery concerns. The resin bezel keeps weight low, while the shock-resistant structure makes sure the watch is durable. It also includes a high-visibility LED backlight for use in low-light conditions.

Mudman GW-9500MRY-1A9JF

The Mudman GW-9500MRY-1A9JF, priced at ¥58,410 (~$389), is well-suited for tough environments. It includes Triple Sensor technology with an altimeter, barometer, and compass, along with radio-controlled timekeeping for automatic accuracy adjustments. The dual-layer LCD display contributes to readability, while the mud-resistant construction prevents dirt and water intrusion.

Rangeman GPR-H1000RY-1A9JR

At ¥66,330 (~$442), the Rangeman GPR-H1000RY-1A9JR is easily the most feature-heavy model. It includes GPS tracking, a heart rate monitor, and VO2 max measurement. The six-sensor setup provides real-time environmental data, measuring altitude, air pressure, acceleration, and temperature. The MIP LCD display should be great in outdoor conditions, and the solar-assisted charging extends battery life by a significant amount.

These Master of G models are available on Yahoo! Shopping, Amazon Japan, and Rakuten. Given Casio’s track record with limited production runs, availability may be limited. The watches are expected to arrive in the US, UK and other regions soon enough.

The Casio Rangeman GPR-H1000RY-1A9JR...
The Casio Rangeman GPR-H1000RY-1A9JR...
...the Mudman GW-9500MRY-1A9JF...
...the Mudman GW-9500MRY-1A9JF...
...and the Gravitymaster GR-B300RY-1A9JF. (Image source: Casio)
...and the Gravitymaster GR-B300RY-1A9JF. (Image source: Casio)

Source(s)

Yahoo Japan (1) (2) (3), Casio Japan (1) (2) (3)

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> Expert Reviews and News on Laptops, Smartphones and Tech Innovations > News > News Archive > Newsarchive 2025 02 > Casio's new feature-loaded G-Shock Master of G watches officially released with heart rate monitor and triple sensor tech
Anubhav Sharma, 2025-02-15 (Update: 2025-02-15)