CASIO G-Shock GM2100N-2A Blue Metal Covered Watch

Shock-Resistant Diver's Watch

The GM2100N-2A combines analogue and digital displays in a 44mm stainless-steel case with a blue dial and resin band. Its Carbon Core Guard structure protects the quartz movement from impacts, making it suitable for daily wear and aquatic sports. The watch is water-resistant to 200 metres and fits adult wrists with an adjustable buckle clasp.

Sustained Exposure to Pressure and Impact

The Carbon Core Guard structure maintains shock resistance during continuous vibration or repeated knocks rather than only single drops. Water resistance to 200 metres holds during prolonged immersion at depth, not just brief splashes. Mineral glass protects both dial faces from scratches during extended outdoor use. The CR2016 battery powers all functions for approximately three years under normal daily operation.

Limits of the 200M Rating and Quartz Timing

The 200-metre rating covers swimming and recreational diving but excludes saturation diving or helium-rich environments. Quartz accuracy drifts slightly over months, so the world-time function across 31 zones and 48 cities relies on periodic manual correction. The auto-calendar runs to 2099, after which date tracking requires a reset. Button-operation tones can be silenced for stealth, but the double LED light remains the sole illumination method in total darkness.