Casio G-Shock Master of G GR-B300-8A2ER

Introducing a new addition to the G-SHOCK Master of G collection: the GRAVITYMASTER GR-B300, a professional aviation-inspired watch designed to perform even in the most challenging environments. The GR-B300 features a Carbon Core Guard structure for maximum durability. The carbon fiber-reinforced resin case and bezel design, inspired by next-generation aircraft, merge into a bold and powerful form. See the world through a pilot's eyes with the flight log memory function to record current location and time, and simultaneous display of time in two time zones. Just tap the app to instantly switch between your home time zone and local time, a convenient and useful feature when traveling abroad. Large hour markers and a stainless steel bezel enhance the dial's breadth, ensuring improved visibility, crucial for pilots whose work demands quick and intuitive time reading. The black and white color combination evokes the appearance of a cockpit instrument panel. The main resin components used for the case, bezel, and strap are made from bio-based resin, a material designed to help reduce environmental impact.

Basic information
Case size: 59 × 54.7 × 15.7 mm
Weight: 71 g
Case and bezel material: bio-based carbon and bio-based resin
Strap: adjustable bio-based resin (145–215 mm)
Structure: shock-resistant with Carbon Core Guard
Water resistance: up to 20 bar

Power supply
System: Tough Solar (solar powered)
Battery life: approx. 5 months without light, up to 18 months in power-saving mode
Battery indicator: yes

Connection and app
Bluetooth®: automatic smartphone link
App: CASIO WATCHES
Smart functions: automatic time adjustment, world time (approx. 300 cities), flight log, phone finder

Exterior
Glass: mineral
Crown: screw-lock
Luminescence: Neobrite
Illumination: white Super Illuminator LED

Watch functions

World time:
second time zone available

Stopwatch:
up to 23:59:59
modes: elapsed time, split time

Timer:
countdown from 1 minute to 24 hours
measuring unit: 1 second

Alarms and signals:
daily reminder alarm
hourly time signal

Calendar:
full auto-calendar up to 2099
date display (day of month)

Accuracy:
±15 seconds per month (without Mobile Link)

Other features:
power saving with automatic hand stop
automatic synchronization via app

Fit
Adjustable strap: 145 to 215 mm