Casio G-Shock Gravitymaster GR-B300-8A2ER Men's Watch • Tough Solar • Bluetooth Smartphone Link

The Casio G-Shock Gravitymaster GR-B300-8A2ER is a pilot's watch from the Master of G line, inspired in design and function by the world of aviation. The grey-blue dial evokes a Head-Up Display (HUD) in a cockpit: a three-layer dial with raised indices and blue accents on the hands and markers creates a three-dimensional look with outstanding legibility. The Carbon Core Guard case – made from a bio-based carbon fibre composite material also used in aircraft fuselages – combined with a screw-lock crown guard delivers exceptional shock resistance and water resistance to 200 m.

The Tough Solar movement charges via light and connects via Bluetooth to the CASIO WATCHES app to synchronise the time automatically up to four times a day. Additional features including world time covering around 300 cities, dual time, stopwatch, countdown timer, daily alarm and a Super Illuminator LED light make the GR-B300-8A2ER a reliable companion for demanding missions. A battery level indicator at the 9 o'clock position and a mode indicator at 12 o'clock deliver tactical information at a glance.

Key Features of the Casio GR-B300-8A2ER Watch

• Tough Solar with Bluetooth Sync: Solar power combined with automatic time adjustment via smartphone app for maximum timekeeping accuracy.
• Carbon Core Guard Case: Bio-based carbon fibre composite sourced from aerospace technology delivers superior shock resistance at minimal weight.
• 200 m Water Resistance: Screw-lock crown and robust construction provide reliable protection even under extreme conditions.

Care Instructions for Wristwatches

Care & Cleaning

• Daily: Wipe case and bracelet with a soft, dry cloth to remove dirt and perspiration.
• Water-resistant watches: Clean with mild soapy water and a soft brush, rinse, dry thoroughly.
  Important: Screw the crown down firmly beforehand!!!
• Not water-resistant: Clean only dry or slightly damp, do not use water or cleaning agents.
• Avoid: Harsh chemicals, perfume, cosmetics and heat.
• Leather straps: Do not soak, clean only slightly damp and allow to dry away from heat.
• Water resistance: Do not wear in the shower or bath, have it tested annually.
• Battery (quartz): Have a depleted battery replaced immediately.
• Mechanical watches: Service by a master watchmaker every 5 years.

Storage & Handling

• Store the watch separately, not in direct contact with other jewellery (risk of scratching).
• Place mechanical watches on a flat surface when winding, do not leave the crown pulled out.