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 fiber-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 color scheme dotted with color accents on the dial and buttons evokes the look of a cockpit instrument panel, while dark color 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.

MSRP

RM179.00
(Original RM799.00)

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MASTER OF G - AIR
GRAVITYMASTER

GR-B300-1A

An organic form inspired by next-generation aircraft is expressed.
An organic form inspired by next-generation aircraft is expressed.
An organic form inspired by next-generation aircraft is expressed.
An organic form inspired by next-generation aircraft is expressed.
An organic form inspired by next-generation aircraft is expressed.
An organic form inspired by next-generation aircraft is expressed.
LED Light
Back engraving
LED Light

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20 bar water resistant
Lets you know your direction
Lets you know the temperature
Collaboration model
Lets you know the barometric pressure and altitude
Shock resistant

Specifications

Operation Guide

Price
MSRP RM179.00 (7̶9̶9̶RM)
Weight
71 g
Water resistance
200-meter water resistance
Power supply and battery life
Charging system compatible with dedicated cable (requires device with Type-A USB terminal)
Solar powered
Case size (L× W× H)
59 × 54.7 × 15.7 mm
Band
Bio-based resin band
Water resistance
200-meter water resistance
Power supply and battery life
Tough Solar (Solar powered)
Time adjustment
Bluetooth: Connects to a smartphone and automatically adjusts the time
Basic Information
Smartphone Link feature
Mobile link (Automatic connection, wireless linking using Bluetooth®)
Apps
CASIO WATCHES
App connectivity feature
Auto time adjustment
Easy watch setting
Time Zone setting
Approximately 300 world time cities
Notification function (incoming calls, incoming e-mails, new social media posts, calendar notifications, reminders)
Training analysis data
Activity history
Life log data
Sleep analysis data
Tide graph setting (approximately 3,300 global points)
Phone finder

Smartphone Link/App Connectivity Features
Glass
Mineral Glass
Compatible band size
145 to 215 mm
Exterior
World time
World time
38 time zones* (38 cities + coordinated universal time), daylight saving on/off, auto summer time (DST) switching
*May be updated when connected to a smartphone.

Moon data
Moon data (moon age of the specific data, moon phase)
Tide graph
Tide graph
Sunrise/sunset Display 
Sunrise, sunset time display
Sunrise time and sunset time for specific date

Stopwatch
1-second stopwatch
Measuring capacity: 99:59'59''
Measuring modes: Elapsed time, split time

Timer
Measuring unit: 1 second
Countdown range: 60 minutes
Countdown start time setting range: 1 second to 60 minutes (1-second increments)

Alarm/hourly time signal
4 daily alarms with snooze
Smart alarm (with snooze)
Light
LED backlight (Super Illuminator)
Full auto LED light, selectable illumination duration (1.5 seconds or 5 seconds), afterglow
Light color
LED:White
Calendar
Full auto-calendar (to year 2099)
Mute feature
Button operation tone on/off
Energy saving feature
Power Saving (display goes blank to save power when the watch is left in the dark)
Battery display/alert
Battery level indicator
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)

Accuracy
Accuracy: ±15 seconds per month (with no GPS signal reception and mobile link function)
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)

Sensor feature details
* The blood oxygen level measurement function is not intended as a medical device for diagnosing specific diseases. It is intended for general health maintenance only.
Watch Features

Movie

Application

Multiple functions, all at your fingertips

CASIO WATCHES

(Smartphone app)

  • Automatic time adjustment*
  • World Time for over 300 cities*
  • Alarm/Timer setting
  • Phone Finder

* Updating of internal data according to the latest time zone/ daylight saving time information

Confrim OS version

* The Bluetooth® wordmark and logo are registered trademarks of Bluetooth SIG, Inc. and any use of these marks by Casio Computer Co., Ltd. is under license.
* Apple, Apple logo and iPhone are trademark of Apple Inc. registered in the United States and other countries. App Store is a service mark of Apple Inc.
* IOS is a trademark or registered trademark of Cisco Systems, Inc. registered in the U.S.
* Google Play and the Google Play logo are trademarks of Google LLC.
* All other company and product names are trademarks or registered trademarks of their respective owners.

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*The color tone of the listed products may differ from the actual product in some cases.

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