GM110G-1A9 Casio Analog-Digital G-Shock Watch

GM110G-1A9 Casio Analog-Digital G-Shock Watch

GBA900RD-4A Casio Analog-Digital G-Shock Watch

GBA900RD-4A Casio Analog-Digital G-Shock Watch

GRB200-1A9 Casio Master of G Air GRAVITYMASTER G-Shock Watch



GRB200-1A9 Casio Master of G MUDMASTER G-Shock Watch

These Quad Sensor Bluetooth connected G-SHOCK Master of G “GRAVITYMASTER" GRB200 models pack flight mission essential functions into a tough and rugged carbon core guard structure.

A high-strength, highly weather-resistant Carbon Core Guard Structure protects the module with a resin case reinforced with carbon fibers. This, combined with world-renowned G-SHOCK shock resistance, creates a structure that is also highly vibration resistant.

The bezel is made up of three layers of resin with carbon fiber inserts. The top layer is semi-transparent to reveal the carbon material inside. The three buttons on the right side of the watch are arranged in a way that makes them resemble a fighter jet control stick, while also contributing to ease of operation.

The Quad Sensor system of these models uses compact sensors that make it possible to pack compass, altitude/barometer, and temperature measurement capabilities, along with an accelerometer that keeps track of your step count, into a compact configuration. This makes it easy to keep tabs on the natural environment around you and to maintain logs of your activities for comprehensive flight mission support. A special G-SHOCK phone app simplifies configuration of watch settings, and also provides a Mission Function.

MUDMASTER - Extreme Survival Fitness

  • Bluetooth smartphone link

  • Carbon Core Guard Structure

  • Quad Sensor: Thermometer, Altimeter/Barometer, Digital Compass, Step Counter

G-Shock - Toughest Watches featuring Atomic Timekeeping and Tough Solar Technology


GRB200-1A9 Casio Master of G Rangeman G-Shock Watch

  • Resin Band

  • Carbon Core Guard Structure

  • Shock Resistant

  • Vibration Resistant

  • Mineral Glass

  • 200-meter water resistance

  • Double LED light

    • LED light for the face (Auto LED light, Super illuminator, selectable illumination duration (1.5 seconds or 3 seconds), afterglow)

    • LED backlight for the digital display (Auto LED light, Super illuminator, selectable illumination duration (1.5 seconds or 3 seconds), afterglow)

  • Mobile link (Wireless linking using Bluetooth®)

  • Digital compass

    • Measures and displays direction as one of 16 points

    • Measuring range: 0 to 359°

    • Measuring unit: 1°

    • 60 seconds continuous measurement

    • Hand indication of north

    • Magnetic declination correction

    • Direction calibration (2-point calibration, figure eight calibration, auto calibration)

  • Altimeter

    • Measuring range: –700 to 10,000 m (–2,300 to 32,800 ft.)

    • Measuring unit: 1 m (5 ft.)

    • Hand indication graph of altitude differential

    • Manual memory measurements (up to 14 records, each including altitude, date, time)

    • Auto log data (High/low altitudes, cumulative ascent and descent)

    • Others: Relative altitude readings (±100 m /±1000 m), selectable measurement interval: 5 seconds or 2 minutes (1 second for first 3 minutes only)

    • *Changeover between meters (m) and feet (ft)

  • Barometer

    • Measuring unit: 1 hPa (0.05 inHg)

    • Hand indication of pressure differential (±10 hPa)

    • Atmospheric pressure tendency graph (last 20 hours or last 56 hours)

    • Barometric pressure tendency information alarm (beep and arrow indicates significant changes in pressure)

    • The atmospheric pressure tendency graph can show the last 20 minutes or last 56 minutes of measurements.

    • The hand indication of pressure differential shows values in units of ±1 hPa.

    • *Changeover between hPa and inHg

  • Thermometer

    • Measuring range: –10 to 60°C (14 to 140°F)

    • Measuring unit: 0.1°C (0.2°F)

    • *Changeover between Celsius (°C) and Fahrenheit (°F)

    • Step count using a 3-axis acceleration sensor: 0 to

    • 999,999 step count display range

  • Power Saving: Auto sensor sleep state entry after fixed period of non-activity

  • World time

    • 38 time zones (38 cities + coordinated universal time),

    • daylight saving on/off, Home city/World time city swapping

    • Sunrise, sunset time display

    • Sunrise time and sunset time for specific date

  • 1/100-second stopwatch

    • 00'00''00~59'59''99 (for the first 60 minutes)

    • 1:00'00~23:59'59 (after 60 minutes)

    • Measuring unit:

    • 1/100 second (for the first 60 minutes)

    • 1 second (after 60 minutes)

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

  • Countdown timer

    • Measuring unit: 1 second

    • Countdown range: 24 hours

    • Countdown start time setting range: 1 second to 24 hours (1-minute increments and 1-hour increments)

  • 5 daily alarms

  • Hourly time signal

  • Hand shift feature

  • Full auto-calendar (to year 2099)

  • 12/24-hour format

  • Button operation tone on/off

  • Regular timekeeping:

    • Analog: 3 hands (hour, minute, second)

    • Digital: Hour, minute, second, am/pm, month, date, day

    • Accuracy: ±15 seconds per month (with no mobile link function)

  • Approx. battery life: 2 years on CR2025

  • Size of case : 63x54.1x18.3mm

  • total weight : 80g


GRB200-1A9 Casio Master of G MUDMASTER G-Shock Watch


International and Express Shipping available at Check Out.


Casio Timepiece warranty


This product, except consumables or articles with limited resistance (e.g. battery, band, case), is warranted to the original purchaser to be free from defects of quality at the time of delivery for a period of one year from the date of purchase ("warranty period"). During the warranty period, and upon proof of purchase, the product will be repaired using CASIO reconditioned replacement parts or the product will be replaced with the same or a similar reconditioned replacement model within a reasonable period of time. To obtain these warranty services, please take or send the product, postage paid, with a copy of your sales receipt or other proof of purchase that shows the date of purchase, to a CASIO Service Center such as TQ Diamonds. There will be no parts or labor charge to you for valid warranty services.

This warranty is void if your watch was purchased from an online auction site or has been damaged by unauthorized service, negligence or accident, or other causes not relating to defective material or workmanship.

Casio AUTHORIZED dealer!

Don't risk losing your warranty buying a watch from an online auction site that can't offer a valid warranty! TQ Diamonds is your #1 authorized dealer.

Established in 1987

TQ Diamonds - customers have been buying with SAFETY and SECURITY since 1987!


CLICK or CALL or 608-833-4500

Authorized Casio G-Shock Sales Partner Logo