FINAL SALE

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The sky’s the limit! Introducing the GRAVITYMASTER GR-B300, a piece of aviation-inspired professional gear designed to work even in the harshest environments, from the G-SHOCK MASTER of G line.

The GR-B300 features a Carbon Core Guard structure, which delivers the shock-resistance, rigidity, and corrosion-resistance of carbon material used in aircraft fuselages. The carbon fibre reinforced resin case and the seamless bezel design inspired by next-generation aircraft come together in a bold and powerful form.

Envision the world through a pilot’s eyes with the flight log memory function for recording current location and time, as well as dual-time simultaneously displaying the time in two time zones. In addition, simply tap on the app to instantly switch between the time back home and local time — a practical function to make traveling abroad that much smoother. Large, dimensional index marks and a metal bezel accentuating the large watch face exude functionality, enhancing the visibility that is so important for pilots, whose job demands intuitive reading of time. The rotary disc indicator at the 9 o’clock position uses a dual-coil motor to ensure smooth rotation and functional beauty. The indicator not only rotates to display alarm on/off and stopwatch; it functions as a battery level indicator as well. The high-contrast black and white colour scheme dotted with colour accents on the dial and buttons evokes the look of a cockpit instrument panel, while dark colour variations express the practical functionality of an aviation worldview.

Key resin components used in the case, bezel, and band are made with bio-based resin, a material expected to help reduce environmental impact.

Due to the high volume of orders during our peak period, please be advised that there may be a delay of 3-5 business days in the dispatch of your order.

All sales are considered final and are not available for refund or exchange. Please make your selection carefully. Terms and conditions apply.

Thank you for shopping with CASIO.

This product cannot be returned or exchanged unless faulty.

Band

Bio-based resin band

Case and bezel material

Bio-based Carbon / Bio-based resin

Case size (L× W× H)

Case dimensions (length x width x height) shown here are standard values and may differ from actual product dimensions. Use the case dimensions provided here as general reference values.

* Dimensions show the measurements indicated in the illustration above.

59 × 54.7 × 15.7 mm

Construction

Shock Resistant
Carbon Core Guard structure

Power supply and battery life

Tough Solar (Solar powered)

Time adjustment

Bluetooth: Connects to a smartphone and automatically adjusts the time

Water resistance

200-metre water resistance

Weight

71 g

Compatible band size

145 to 215 mm

Crown

Screw Lock Crown

Glass

Mineral Glass

Other

Neobrite

App connectivity feature

Auto time adjustment
Easy watch setting
Approximately 300 world time cities
Flight log
Phone finder

Apps

CASIO WATCHES

Smartphone link feature

Mobile link (Wireless linking using Bluetooth®)

Accuracy

Accuracy: ±15 seconds per month (with no mobile link function)

Alarm/hourly time signal

Daily alarm

Battery display alert

Battery level indicator

Calendar

Full auto-calendar (to year 2099)

Energy saving feature

Power Saving (hands stop to save power when the watch is left in the dark)

Light

LED light (Super Illuminator)
Afterglow

Other features

Date display
Day indicator
Regular timekeeping:
Analog: 3 hands (hour, minute (hand moves every 10 seconds), second), 3 dials (dual time hour and minute, dual time 24-hour, day)

Run time

Approx. battery operating time:
5 months on rechargeable battery (operation period with normal use without exposure to light after charge)
18 months on rechargeable battery (operation period when stored in total darkness with the power save function on after full charge)

Stopwatch

1-second stopwatch
Measuring capacity: 23:59'59.
Measuring modes: Elapsed time, split time

Timer

Countdown timer
Measuring unit: 1 second
Countdown range: 24 hours
Countdown start time setting range: 1 minute to 24 hours (1-minute increments and 1-hour increments)

World time

Dual time (Home City time swapping)

Operation Guide

A timepiece for aviation lovers with a cutting-edge design delivering strength and functionality

Name: GRB300-1A4
Brand: G-SHOCK
SKU: GRB300-1A4
Price: 552.0 AUD
Availability: OutOfStock

Introducing a trio of new models featuring the Carbon Core Guard structure, which leverages the special properties of a carbon material also used in aircraft fuselages. This structure, combined with the seamless bezel design inspired by next-generation aircraft, creates a form both cutting-edge and powerful. Enjoy all the practical features as well, including dual-time simultaneously displaying the time in two time zones and a flight log memory function for recording the current location and time, routes travelled, and more. The sky is the limit — so this watch expresses a passion for aviation in a style befitting the GRAVITYMASTER line.

Seamless design offering functional beauty

An organic form inspired by next-generation aircraft is expressed with the seamless exterior design. A sense of unity is achieved by connecting the exterior surfaces, from the case to the band, smoothly and seamlessly. This design creates a tough, cutting-edge look, seemly for a new addition to the GRAVITYMASTER line.

3D face design for enhanced readability

The large-diameter, triple-layer dial with a sense of depth ensures readability for pilots, whose job demands intuitive reading of time. In addition to large, dimensional index marks and inset dials inspired by instrument panels, the metal bezel accentuating the large watch face ensures this design exudes functionality.

Dual time: Simultaneous display of time in two cities

The main dial and inset dial simultaneously display times in two cities located in different time zones. A dedicated app makes it easy to configure world time settings. Switching between home time and world time is a snap, as well. This watch puts accurate time management just a fingertip away.

Colouration evoking the look of a cockpit

A high-contrast black and white colour scheme enhances the visibility of the watch hands and index marks, components responsible for the most vital watch functions. Red and blue colour variations are offered as well, with the red model inspired by the display colour of a cockpit instrument panel’s nighttime illumination, and the blue, that of a head-up display (HUD). These distinctive combinations of colour deliver practical functionality expressing an aviation worldview.

Flight log: Helpful for flight history management

Sync the watch with a smartphone and press a button on the watch to record the current time and position on a map within the dedicated app — a useful function for managing flight logs with details including times and locations of departure and arrival. In addition, plotted data can be grouped for batch management of travel record details including points of departure, transit points, and home destinations.

Layer Guard and Carbon Core Guard structures: Featuring innovative combinations of materials

The intricately shaped bezel employs integrated moulding and has two rings — a metal ring and a urethane ring — installed beneath it. This combination of materials gives the bezel — a structural component — a refined visual presence that embodies the intricacy and sophistication of next-generation aircraft. The case is made with carbon fibre-reinforced resin, a material delivering both strength and lightness. The side buttons have anti-slip texturing inspired by hazard warning stripe tapes, and the guards beneath the buttons have been eliminated for even better operability.