Casio G-Shock Master of G-Air Gravitymaster - GRB300-8A2
Casio G-Shock Master of G-Air Gravitymaster - GRB300-8A2
Casio G-Shock Master of G-Air Gravitymaster - GRB300-8A2
Casio G-Shock Master of G-Air Gravitymaster - GRB300-8A2
Casio G-Shock Master of G-Air Gravitymaster - GRB300-8A2
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Casio G-Shock Master of G-Air Gravitymaster - GRB300-8A2

1In stock

The sky’s the limit! Introducing the GRAVITYMASTER GRB300,
a piece
of aviation-inspired...

Please hurry, only 1 left in stock


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Casio G-Shock Master of G-Air Gravitymaster - GRB300-8A2

The sky’s the limit! Introducing the GRAVITYMASTER GRB300,
a piece
of aviation-inspired professional gear designed to work
even in
the harshest environments, from the G-SHOCK MASTER
of G line.

The GRB300 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 & 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 
and local time — a practical function to make traveling abroad
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.

Case size: 59 × 54.7 × 15.7 mm
Weight: 71 g
Case & bezel material: Carbon / Bio-based resin
Band: Bio-based resin band
Construction: Shock Resistant
Carbon Core Guard structure
Water resistance: 200 meters
Time adjustment
Bluetooth: Connects to a smartphone & automatically adjusts the time
Power supply and battery life: Tough Solar / Solar powered

Smartphone Link/App Connectivity Features 
Smartphone Link feature: Mobile link (Wireless linking using Bluetooth®)


App connectivity feature
Auto time adjustment
Easy watch setting
Approximately 300 world time cities
Phone finder

Glass: Mineral Glass
Crown: Screw Lock Crown
Compatible band size: 145 to 215 mm
Other: Neobrite

Watch Features

World time
Dual time (Home City time swapping)

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

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)

Alarm/hourly time signal
Daily alarm

LED light (Super Illuminator)

Light color

Full auto-calendar (to year 2099)

Energy saving feature
Power Saving (hands stop 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: ±15 seconds per month (with no 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)


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• Free 2nd Day Air shipping by FedEx or UPS
• Orders will be processed and shipped in 24-48 hours within USA.
• Orders will be shipped only to billing street address, no PO Box, APO or FPO address.
• You will receive Tracking number as soon as the order is processed.
• All shipments are insured and require Adult Signature.
• Please make sure someone is at the address to sign and accept the package when delivered.
• No international shipping.
• For returns contact us within 15 days for authorization.
• All watches must be returned in original condition, complete original packaging including manual and warranty card.
Jewelry Pavilion is an Authorized Dealer for all the Brands that are sold on this website. All watches are 100 % Authentic. Brand New. Original Packaging complete with Watch Instruction Manual and Warranty Card. All watches come with Manufacturers Warranty.

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