G-Shock GDF100-1B (GDF100-1BCR) : UnBoxing

Another fantastic bargain I picked up on my holidays this year!

I have been keeping an eye on the Casio G-Shock GDF100 Series on Amazon, eBay and a few other watch retailers that I could find stocking in the UK, however prices were increasing on a weekly basis, then I came across this little puppy in the Florida Mall, a happy day it was!

It matches my requirements for a watch perfectly, a big, cool, G-Shock.

The Casio Site describes it as follows :

At A Glance

This totally new design for G-Shock comes packed with altimeter, barometer and thermometer, plus a powerful collection of additional features. Its design has been carefully crafted to incorporate a number of basic elements that reflect G-Shock’s unique individuality.

  • Front-Facing Twin Sensor Design (Altimeter/Barometer & Thermometer)
  • Super Illuminator LED
  • 48-City World Time


  • Band Type:  Resin
  • Color:  Black
  • Dial Code:  Digital

Technical Specs

  • Shock Resistant
  • 200M Water Resistant
  • LED Backlight (Super Illuminator)
  • Altimeter
    Measuring range: -700 to 10,000m (-2,300 to 32,800ft) without reference altitude
    Measuring unit: 5m (20ft)
    Others: Reference altitude setting
  • Barometer
    Display range: 260 to 1,100 hPa (7.65 to 32.45 inHg)
    Display unit: 1 hPa (0.05 inHg)
    Atmospheric pressure differential pointer
  • Thermometer
    Display range: -10 to 60 C (14 to 140 F)
    Display unit: 0.1 C (0.2 F)
  • World Time
    31 times zones (48 cities), city code display, daylight saving on/off
  • 5 Daily Alarms
  • Hourly Time Signal
  • 1/100 second stopwatch
    Measuring capacity: 23:59’59.99”
    Measuring modes: Elapsed time, split time, 1st-2nd place times
  • Countdown Timer
    Measuring unit: 1 second
    Countdown range: 1 minute to 24 hours (1 hour increments and 1 minute increments)
  • Full Auto Calendar (pre-programmed until the year 2099)
  • 12/24 Hour Formats
  • Button tone operation on/off
  • Accuracy: +/-15 seconds per month (with no signal calibration)
  • Battery: CR2025
  • Approx. battery life: 5 years
  • Module: 3255

Size of case/total weight
GDF100BTN 55.0 x 51.5 x 17.2mm / 70g
GDF100 55.0 x 51.5 x 17.2mm / 69.2g

UnBoxing Gallery :

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 photo P1060774_zpse52651d9.jpg photo P1060775_zps9de91e7b.jpgThe watch itself does what you expect G-Shocks to do, be big, be tough and keep the time, everything else / anything else is a bonus.

This model (GDF-1001B) has an inverted display, illuminated by a blue black light, in daylight it is easy to read and in the dark the new blue light makes the display simple to read, the inverted displays are often difficult to read in the dark using a traditional backlight.  As well as aiding in the reading of the display the blue backlight is a nice change and looks great!

The thermometer is a nice touch but its position against the arm, or under a cuff basically reads skin temperature, taking it off and leaving it for 30 to allow it to acclimate isn’t really an option.

The barometer is a bit more accurate although to be fair I have no use for it, nor do I fully understand it although I like it anyway.  I understand the Altimeter and when calibrated to sea level it is pretty accurate and nice touch, and at least I’ll always now where sea level is.

The watch is comfortable, fits well, sits well, and would be comparable in size on the wrist to a GA-100 series, the face being made bigger by the sensor.  People have queried as to whether the sensor being located on the inside of the arm is uncomfortable, however I can assure you it goes totally un-noticed.

Another great G-Shock from the masters of tough!

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