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, an aviation-inspired professional watch designed to perform in even the harshest environments. The GR-B300 features a Carbon Core Guard construction for maximum durability. The carbon fiber-reinforced resin case and bezel design, inspired by next-generation aircraft, blend together in a bold and powerful form. See the world through a pilot's eyes with the flight log memory function to record your current location and time, and with dual time zone displays. Simply tap the app to instantly switch between home time and local time, a convenient feature when traveling abroad. Large indices and a stainless steel bezel add to the spaciousness of the dial, ensuring improved visibility—essential for pilots whose work requires quick and intuitive time reading. The black and white color scheme evokes the look 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.

Technical Specifications

Basic Information

• Case dimensions (H x W x D) : 59 × 54.7 × 15.7 mm

• Weight : 71 g

• Case and bezel material : Bio-based carbon / Bio-based resin

• Strap : Bio-based resin, adjustable from 145 to 215 mm

• Construction : Impact-resistant, with Carbon Core Guard

• Water resistance : Up to 20 bar

Power and Battery Life

• Power Type : Tough Solar

• Battery life :

  • 5 months with rechargeable battery (without exposure to light after full charge)

  • 18 months (if stored in total darkness with energy saving activated)

• Battery status display : Battery level indicator

Smartphone Connection and Functions

• Bluetooth Function : Automatically connects to your smartphone to adjust the time

• Compatible App : CASIO WATCHES

  • Automatic clock adjustment

  • World time for about 300 cities

  • Flight log

  • "Find my phone" function

Watch Features

• World Time : Ability to display the time in the second time zone

• Stopwatch :

  • Measure up to 23:59'59 (1 second)

  • Mode: Elapsed time, Split time

• Timer :

  • Unit of measurement: 1 second

  • Range: 1 minute to 24 hours

• Sound Reminder / Hourly Signal : Daily Alert

• Calendar : Full automatic calendar up to 2099

• Light : White LED (Super Illuminator) for visibility in the dark

• Neobrite : Clear luminescence

Additional Functions

• Energy Saving : The hands stop automatically when the watch is in the dark.

• Auto Clock Adjustment : Connects to the app to automatically sync

• Date Display : Day of the month display

Precision and Reliability

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

External

• Glass : Scratch-resistant mineral glass

• Crown : Screw-down for improved water resistance and durability

• Strap : Adjustable from 145mm to 215mm for a perfect fit