Casio G-Shock GAS-100 Series

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About GAS-100 in Short. From G-SHOCK, the watch brand that is constantly setting new standards for timekeeping toughness, come new models based on the big case Tough Solar GAS-100.


General Information

Price$120  *average Amazon Price, we may earn commission from purchases
Year of First Release2017
Battery Type Solar (Casio Batteries)
Manual5445 (official)

GAS-100 Model Range *may be updated

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Casio GAS-100 on the wrist!


Official GAS-100 Specs / Features *for base version GAS-100-1A

  • Case / bezel material: Resin / Stainless steel
  • Resin Band
  • Shock Resistant
  • Mineral Glass
  • 200-meter water resistance
  • Double LED light
    LED light for the face (Full auto LED light, Super illuminator, selectable illumination duration (1.5 seconds or 3 seconds), afterglow)
    LED backlight for the digital display (Full auto LED light, Super illuminator, selectable illumination duration (1.5 seconds or 3 seconds), afterglow)
  • Tough Solar (Solar powered)
  • World time
    31 time zones (48 cities + coordinated universal time), daylight saving on/off, Home city/World time city swapping
  • 1/100-second stopwatch
    Measuring capacity: 59’59.99”
    Measuring modes: Elapsed time, split time, 1st-2nd place times
  • Countdown timer
    Measuring unit: 1 second
    Countdown range: 100 minutes
    Countdown start time setting range: 1 second to 100 minutes (1-second increments, 1-minute increments)
  • 5 daily alarms
  • Hourly time signal
  • Hand shift feature (Hands move out of the way to provide an unobstructed view of digital display contents.)
  • Battery level indicator
  • Power Saving (display goes blank to save power when the watch is left in the dark)
  • Full auto-calendar (to year 2099)
  • 12/24-hour format
  • Button operation tone on/off
  • Regular timekeeping
    Analog: 2 hands (hour, minute)
    Digital: Hour, minute, second, pm, month, date, day
  • Accuracy: ±15 seconds per month
  • Approx. battery operating time:
    8 months on rechargeable battery (operation period with normal use without exposure to light after charge)
    19 months on rechargeable battery (operation period when stored in total darkness with the power save function on after full charge)
  • Size of case : 55.1×52.5×16.7mm
  • Total weight : 76g

You ask, we answer…

What does 200-meter water resistance in GAS-100 mean?

The watch is good for swimming but not for deep diving.

What type of battery does GAS-100 have?

Solar Powered.

Does GAS-100 have alarm?

Yes, it has 5 daily Alarms.