GA-100-1A2

The Casio G-Shock GA-100-1A2 is a rugged, large-case analog-digital combination watch featuring a matte black resin exterior accented by striking blue hands and dial rings. Known for its indestructible build, it is a mainstay in the Casio G-Shock Lineup that offers professional-grade timekeeping under extreme conditions.

Key Technical Specifications

Case Dimensions: 55 × 51.2 × 16.9 mm

Weight: 70 grams

Material: Resin case, bezel, and band with a scratch-resistant mineral glass crystal

Water Resistance: 200 meters (20 bar), making it suitable for high-impact swimming and divingDurability: ISO-standard shock resistance and JIS Class-1 magnetic resistancePower Source: Approximately 2-year battery life on a CR1220 coin cell

Core Features Advanced

Stopwatch: Measures time down to 1/1000th of a second with a capacity of up to 100 hours.

Velocity Indicator: Calculates and displays your average speed if you input a set distance before starting the stopwatch.

World Time: Supports 29 time zones across 48 major cities globally with home city swapping.

Alarms & Alerts: Includes 5 independent daily alarms (with 1 snooze alarm) and an optional hourly time signal.

Auto-LED Light: Features an amber LED backlight with an “Auto-Light” switch that automatically illuminates the face when you tilt your wrist toward you.

Expert & User Insights Sturdy Yet Lightweight: Reviewers on community forums praise the watch for feeling nearly weightless on the wrist despite its oversized “XL” aesthetic.

Legibility Considerations: While the analog hands stand out sharply due to the blue contrast, some users note that the inverted (negative) digital LCD screens can be difficult to read in dim lighting environments without using the backlight.