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Casio G-Shock Gravitymaster Series Watch - Black
EE Model #: GRB2001A
Manufacturer Model #: GRB200-1A
UPC/EAN: 889232280103

Casio G-Shock Gravitymaster Series Watch - Black

EE Model #: GRB2001A
Manufacturer Model #: GRB200-1A
UPC/EAN: 889232280103


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At a Glance

  • Shock resistant
  • 200m water resistance
  • Easy to see in darkness
  • Check dual city time at a glance
  • Altimeter
  • Baromter
  • Digital Compass
  • Approx. battery life: 7 years on CR2016

What's in the Box

  • G-Shock Gravitymaster Series Watch - Black
  • Documentation

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Casio GRB2001A view 1
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Manufacturer's Description

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Product Description

This is a Quad Sensor-equipped model in the G-Shock Gravitymaster Series, designed for pilots working in harsh conditions. Its structure combines a carbon fiber-reinforced resin case with a Carbon Core Guard that protects the module, offering shock resistance and fortifying the watch against vibrations. The resin that forms the bezel area has a three-layer Carbon Fiber Insert structure, making it wear-resistant. The three buttons at 3 o'clock have been designed to resemble a helicopter control stick, while also achieving ease of use. An iconic red has been used on the dial and to symbolize the strength and spirit of air rescue teams. Function-wise, this model comes equipped with a Quad Sensor featuring compass, altimeter/barometer, temperature reader and pedometer. It also offers time correction by linking to the dedicated G-Shock app, and the Mission Log feature allows the various data obtained by the watch to be recorded in the app. You can also use the app to set modes on/off and customize settings, including switching between displays. This is a Gravitymaster model that embodies the mobility of a helicopter along with all the functions and toughness essential for flight missions.

From G-SHOCK, the toughness watches that are ever evolving in an endless pursuit of strength, this heavy-duty model can be used in tough environments as well as for street fashion.

The nut-like 10-sided bezel is fastened with screws to express the industrial design motif, and is finished in a rugged, tough, and straightforward design. The combination of analog hands with a digital display also enhances usability. High visibility is achieved, even in the powerful face, by inserting graphics on the hands and dial. Additionally, the lug ends of the band and all the function buttons, including the front button, are engraved with non-slip checkering for excellent operability.

A work-style G-SHOCK that is both tough and fashionable.

World time

31 time zones (48 cities + coordinated universal time), daylight saving on/off, Home city/World time city swapping, One-touch UTC Time Zone Access

1/100-second stopwatch

Measuring capacity: 23:59'59.99''

Measuring modes: Elapsed time, split time, 1st-2nd place times

Others: target time alarm, direct timing start from the timekeeping mode

Countdown timer

Measuring unit: 1/10 second

Countdown range: 60 minutes

Countdown start time setting range: 1 to 60 minutes (1-minute increments)

Alarm/hourly time signal

5 daily alarms (with 1 snooze alarm)

Hourly time signal

LED light (Super Illuminator)

Selectable illumination duration (1.5 seconds or 3 seconds), afterglow

Light color



Full auto-calendar (to year 2099)
  • Button operation tone on/off
  • Accuracy: + - 15 seconds per month
  • 12/24-hour format
  • Hand shift feature (Hands move out of the way to provide an unobstructed view of digital display contents.)
  • Regular timekeeping:
  • Hour, minute, second, pm, month, date, day

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Product Specifications



Black Resin

Water Resistance:

Case Diameter:
52.8 mm

Case Thickness:
16.9 mm

Product Reviews