The GR-B300-1A is a Gravitymaster from Casio's Master of G line, an aviation-inspired analog watch with a high-contrast black and white dial, a carbon case and Tough Solar power.
Its Carbon Core Guard structure keeps it light at 71 g, a screw-lock crown keeps water out to 200 meters (suitable for swimming and diving that does not require breathing gas), and Bluetooth links it to the CASIO WATCHES app for automatic time setting, dual time and a flight log that saves your time and location.
Key features
- Carbon Core Guard structure with carbon / bio-based resin case
- Tough Solar power with power saving and battery level indicator
- Bluetooth Mobile Link: auto time adjustment, easy settings, about 300 world-time cities, phone finder
- Flight log: record the current time and position from the watch to the app
- Dual time: inset dials show a second time zone, with one-touch home/world time swap
- Rotary disc indicator at 9 o'clock and Layer Guard construction
- Screw-lock crown, high-brightness LED light, Neobrite luminous
SpecificationDetail
Case size (L × W × H)
59 × 54.7 × 15.7 mm
Case / band
Carbon / bio-based resin; bio-based resin band
Water resistance
200 meters
Power
Tough Solar; approx. 5 months on a full charge in normal use, 18 months with power saving
Accuracy
±15 seconds per month without Mobile Link
