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Casio Releases New G-SHOCK with Two Sensors

Shock-Resistant Watch Can Measure Both Atmospheric Pressure/Altitude and Temperature

  • February 10, 2011




TOKYO, February 10, 2011 — Casio Computer Co., Ltd., announced today the release of a new shock-resistant watch in its G-SHOCK lineup—the GDF-100, equipped with two sensors for measuring atmospheric pressure/altitude and temperature.

Since the release of the original G-SHOCK watch in 1983, the brand has continued to evolve, with advanced functions, construction and design all based on outstanding shock-resistance. In 1992, Casio released the DW-6100, the first shock-resistant watch equipped with a sensor. It became popular as a G-SHOCK watch that could measure temperature outdoors. Since then, Casio has developed other high-performance models using its original sensor technology, such as watches with a pressure sensor and a magnetic sensor.

The new GDF-100 is equipped with two types of sensors, one for pressure and the other for temperature, making it highly practical and functional for use in the great outdoors. The GDF-100 was developed not only for those who enjoy outdoor sports but also for men who do hard outdoor work in harsh conditions, such as alpine rescue.

The pressure sensor, installed in the case at the 9 o’clock position and designed to take in ambient air from the front of the watch face, automatically measures atmospheric pressure every two hours. In addition to displaying atmospheric pressure numerically, the new watch shows pressure changes since the previous reading in plus and minus increments of five in a circular indicator at the 2 o’clock position. Accordingly, the user can forecast improvements in the weather based on a positive pressure change, or a deterioration based on a negative pressure change.

The watch also measures altitude up to 10,000 meters, using atmospheric pressure conversion. The altitude is shown every five seconds for the first three minutes after the start of altitude measurement, and is shown every two minutes after that, making the watch very useful for mountain climbing and rock climbing.

Data obtained through the temperature sensor are displayed simultaneously with either the atmospheric pressure or altitude. This allows the user to confirm the current environmental conditions.

High-brightness LEDs have been used for the display backlighting, providing greater display readability in dark locations. With other features such as a world time function that displays the current time in 48 cities, the GDF-100 offers rich functionality in addition to its tough performance.



Water Resistance
200 meters
Tide Graph
Tide level for specific date and time
Measuring range: -700 to 10,000 m (-2,300 to 32,800 ft.) without reference altitude; measuring unit: 5 m (20 ft.); reference altitude setting
Measuring range: 260 to 1,100 hPa (7.65 to 32.45 inHg); measuring unit: 1 hPa (0.05 inHg); atmospheric pressure differential pointer
Measuring range: -10 to 60°C (14 to 140°F); measuring unit: 0.1°C (0.2°F)
World Time
48 cities (31 time zones; daylight saving on/off) and Coordinated Universal Time
1/100-second stopwatch; measuring capacity: 23:59’59.99”; elapsed time; split time; 1st - 2nd place times
Countdown Timer
Measuring unit: 1 second; input range: 1 minute to 24 hours (1-minute increments and 1-hour increments)
5 independent daily alarms; hourly time signal
Other Functions
Full auto-calendar; 12/24-hour format; button operation tone on/off; LED backlight (afterglow and selectable illumination duration: 1.5/3.0 second, Super Illuminator)
Accuracy at Normal Temperature
±15 seconds per month
Battery Life
Approx. 5 years on CR2025
Size of Case
55.0 × 51.5 × 17.2 mm
Total Weight
69.2 g

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