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The Casio G-SHOCK Gravitymaster GR-B300 series is the perfect choice for anyone looking for robust and feature-rich watches. This series includes three impressive models: the GR-B300-1A4, GR-B300-1A and GR-B300-8A2. Each model brings with it unique features and a striking design. Let’s take a closer look at these watches and find out what makes them so special.

Entdecke die Casio G-SHOCK Gravitymaster GR-B300 Serie

The GRAVITYMASTER GR-B300 is a true professional watch, inspired by aviation and made for extreme conditions. It is part of the G-SHOCK “”Master of G”” series, which is known for its robustness. The GR-B300 has a special Carbon Core Guard construction that provides shock resistance, rigidity and corrosion resistance. This technology originates from aircraft construction and makes the watch extremely resistant.

Casio G-SHOCK Gravitymaster GR-B300 Serie

Entdecke die Casio G-SHOCK Gravitymaster GR-B300 Serie

The carbon fiber reinforced resin case and seamless bezel, inspired by modern aircraft, give it a striking and powerful look. With the flight log memory function, you can record your current location and time and simultaneously display the time in two different time zones. This gives you a pilot’s perspective of the world. You can also easily switch between home time and local time – perfect for traveling abroad.

Entdecke die Casio G-SHOCK Gravitymaster GR-B300 Serie

The large index markers and the metal bezel emphasize the oversized dial and improve readability, which is particularly important for pilots who need to tell the time quickly and intuitively. The rotating disk display at the 9 o’clock position is not only functional but also aesthetically pleasing. It not only shows the alarm status and the stopwatch, but also the battery level.

Entdecke die Casio G-SHOCK Gravitymaster GR-B300 Serie

The design in black and white with color accents is reminiscent of a cockpit instrument panel and underlines the practical functionality of the watch from an aviation perspective. The main resin components in the case, bezel and strap are made from bio-based resin, which is intended to help reduce the environmental impact.

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Casio G-SHOCK Gravitymaster GR-B300-1A4

The GR-B300-1A4 impresses with its robust design and eye-catching red accents. This watch is not only an eye-catcher, but also a reliable companion for all adventures.

Casio G-SHOCK Gravitymaster GR-B300-1A4
Casio G-SHOCK Gravitymaster GR-B300-1A4

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Casio G-SHOCK Gravitymaster GR-B300-1A

The GR-B300-1A is the classic version of this series, with a sleek black design and a variety of useful functions.

Casio G-SHOCK Gravitymaster GR-B300-1A
Casio G-SHOCK Gravitymaster GR-B300-1A

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Casio G-SHOCK Gravitymaster GR-B300-8A2

The GR-B300-8A2 combines a striking blue and black design with the same state-of-the-art functions as the other models in this series.

Casio G-SHOCK Gravitymaster GR-B300-8A2
Casio G-SHOCK Gravitymaster GR-B300-8A2

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Technical specifications of the Casio G-SHOCK Gravitymaster GR-B300 series

The Casio G-SHOCK Gravitymaster GR-B300 series has been specially developed for aviation experts and combines extreme robustness with state-of-the-art technology. This series is aimed at pilots and aviation enthusiasts who rely on precision and durability.

Entdecke die Casio G-SHOCK Gravitymaster GR-B300 Serie

Case and Design

  • Material: High-quality resin and stainless steel
  • Diameter: 51 mm
  • Thickness: 18.3 mm
  • Weight: 80 g
  • Case Back: Screwed
  • Water Resistance: Up to 200 meters (20 bar)
  • Shock Resistance: The watch is shock-resistant and offers excellent protection against impacts and vibrations.

Dial and Glass

  • Color: Different color accents depending on the model (Red, Black, Blue)
  • Glass: Mineral glass
  • Illumination: Super Illuminator LED for excellent readability in low light conditions


  • Movement: Tough Solar, powered by sunlight
  • Battery Life: Up to 2 years on a full charge thanks to Tough Solar
  • Functions: Stopwatch, Timer, Alarm, World Time, Illumination


  • Bluetooth® Connectivity: Connects to your smartphone for automatic time adjustment and notifications. The G-SHOCK Connected App provides additional convenience and functionality, such as managing flight logs and reminders.


  • Quad Sensor: Altimeter, Barometer, Thermometer, and Compass. These sensors are ideal for pilots and outdoor enthusiasts who need precise environmental data.

Special Features

  • Illumination: LED lighting for better readability in low light conditions
  • Antimagnetic: Protection against magnetic fields
  • Vibration Resistant: Designed for use in harsh environments
  • Large Buttons: Enable easy operation, even with gloves

Weitere Reviews & News von Casio G-SHOCK


On my blog, you’ll find numerous reviews and news on Casio G-SHOCK watches. From detailed test reports to the latest models – you’ll find everything you need to know about G-SHOCK. Visit for comprehensive information and exciting articles about the world of Casio G-SHOCK.

Over 100 Uhren Videos von Casio G-SHOCK bei YouTube

Casio G-SHOCK YouTube Videos
Casio G-SHOCK YouTube Videos

Discover my extensive collection of videos on YouTube. In my G-SHOCK Playlist, you’ll find over 100 videos on Casio G-SHOCK watches. From unboxings to detailed reviews to practical tips – there’s something for every watch enthusiast.

Experience the diversity and durability of the Casio G-SHOCK Gravitymaster GR-B300 series and find the perfect model for you!


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Technical Details

NameGravity Master GR-B300

Reference numberGR-B300


Categorydigital watches

Price from299,- EUR

Warranty2 years

Auch verfügbar auf Deutsch


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