Detailed PRG-240 technical specs are here →
About PRG-240 in Short. Representative of the tourist destination ProTrek with a triple sensor of the past generation. The model is still relevant due to its universal design, the most informative display and functionality. On board is a triple sensor [barometer / altimeter, thermometer and compass] for studying environmental indicators and direction of movement, information on sunrise and sunset times [useful during fishing and not only] and frost resistance of the hull [stable operation of the display and module at temperature to -20 ° C]. The solar battery forever closes the issue of the need for periodic battery replacement. Thanks to the rotating bezel, you can easily operate with compass data [direction of movement and degree measure of the angle with respect to magnetic north]. The basic functionality is also present – a stopwatch, timer, alarm clock, world clock, calendar.
|Price||220$ *average Amazon Price, we may earn commission from purchases|
|Year of First Release||2010|
|Battery Type||Solar (ProTrek Batteries)|
PRG-240 Model Range *may be updated
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Official Description from Casio. The evolution of PROTREK never stops. These new models embody some of the very best in functional beauty and ease of operation that modern technology has to offer.
The rotary bezel is specially shaped for easy operation, even while wearing gloves. Large letters indicating north, south, east, and west are colored for easy reading.
Dedicated direction, barometer, and altitude buttons provide one-touch access to measurements. Buttons are large with slanted diamond patterns for plenty of slip resistance during operation.
Since “easy to press” often also means “more operation error”, the back cover is designed to make it the same height of the button surfaces, which greatly reduces the chance of operation error. The result is easy button operation, but only when you need it to be.
The number of pointer lines has been increased from 60 to 72 for easier to read World Time and sunrise times. TOUGH SOLAR ensures stable operation even when using power-hungry functions.
Official PRG-240 Specs / Features *for base version PRG-240-1
- Case / bezel material: Resin
- Resin Band
- Mineral Glass
- Direction Bezel
- 100-meter water resistance
- Electro-luminescent backlight
Full auto EL light, selectable illumination duration, afterglow
- Solar powered
- Low-temperature resistant (-10 °C/14 °F)
- Digital compass
Measures and displays direction as one of 16 points
Measuring range: 0° to 359°
Measuring unit: 1°
20 seconds continuous measurement
Graphic direction pointer
Bidirectional calibration and northerly calibration function
Magnetic declination correction
Measuring range: -700 to 10,000 m (-2,300 to 32,800 ft.)
Measuring unit: 5 m (20 ft.)
Manual memory measurements
(up to 25 records, each including altitude, date, time)
High Altitude / Low Altitude memory
Total Ascent / Descent memory
Others: Reference altitude setting, Altitude tendency graph, Altitude differential
*Changeover between meters (m) and feet (ft)
Display range: 260 to 1,100 hPa (7.65 to 32.45 inHg)
Display unit: 1 hPa (0.05 inHg)
Atmospheric pressure tendency graph
Atmospheric pressure differential graphic
*Changeover between hPa and inHg
Display range: -10 to 60 °C (14 to 140 °F)
Display unit: 0.1 °C (0.2 °F)
*Changeover between Celsius (°C) and Fahrenheit (°F)
- Duplex LC display
- World time
31 time zones (48 cities), city code display, daylight saving on/off
- Sunrise, sunset time display
Sunrise time and sunset time for specific date, Daylight pointers
- 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 start time setting range: 24 hours
Countdown start time setting range: 1 minute to 24 hours (1- minute increments and 1-hour increments)
- Daily alarms
5 independent daily alarms
- Hourly time signal
- 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:
Hour, minute, second, pm, year, month, date, day
- Accuracy: ±15 seconds per month
- Approx. battery operating time:
6 months on rechargeable battery (operation period with normal use without exposure to light after charge)
23 months on rechargeable battery (operation period when stored in total darkness with the power save function on after full charge)
- Size of case : 57.3×50.9×15.3mm
- Total weight : 65.4g
ProTrek PRG-240 on the wrist!
Feedback from users *accumulated information from our own comments and emails, forum threads, socials, reviews, etc.
+ solar powered is brilliant, no danger of loosing battery power
+ back light is good with variable time durations
+ the ease of use
+ fantastic looking watch
+ a huge array of functions. Great quality
+ the structure is very durable made to last in all conditions but do not test it as if you were Gshock
– temperature is the temp of your wrist
– the altimeter to be erratic
– the strap loop is very resitent although it can bother if the watch is snug to the wrist
– the wind rose ring external is not snap, so it moves with the friction of the clothes, as it only serves when we orient it with respect to the digital compass
The most distinctive specs of PRG-240 *Editorial
— 100-meter water resistance (good for swimming but not for deep diving)
— Low temperature resistant (stable operation of the watch is guaranteed even at a temperature of -20°C)
— Tough Solar (CASIO’s original solar-charging system converts not only sunlight but also light from fluorescent lamps and other sources into power)
— Digital compass (measures and displays direction as one of 16 points)
— Thermometer (can measure and display the outside temperature in a range from -10 C to 60 C)
— Barometer (measures the air pressures and displays tendencies in the weather)
— Altimeter (The electronic mechanism “estimates” the altitude based on the air pressure)
— Duplex LCD (Giving you a constant overview: Elements on the display are distinguished from one another using colour. This is achieved using different coloured layers placed on top of one another, allowing information to be displayed more clearly)
Other ProTrek PRG Watches *similar by price and functions but different by cases
These are not all ProTrek PRG Series. Here is a list of All ProTrek PRG Watches →
PRG-240 Comparison Table with similar ProTrek Watches
Year of first Release
±15 seconds per month
±15 seconds per month
STN LCD (more distinct and bigger digits)
Cross-Frame Structure (disperses impacts, reinforcing the case’s)
Moon Data (good for fishing and tides)
Full auto EL light, Electro-luminescent backlight
Full auto EL light, Electro-luminescent backlight
Case / bezel material
Size (mm) *we consider 48.9×42.8×13.4 to be a traditional watch size (as in DW-5600). So you are to compare how far or close the watch is to this size
Full features (if you want to know more)
Enjoy Japanese approaches to Travel and Functional ProTrek Watches!
Every adventure needs a reliable partner. PRO TREK is exactly the kind of watch that you need to meet the demands of your interests. PRO TREK is equipped with functions such as solar power operation, a digital compass, an altimeter, a barometer and a thermometer. The combination of innovative technology, a robust precision movement and state-of-the-art design makes the PRO TREK the perfect companion for all adventures under the open sky. Mountain or valley? Forest or meadow? River or lake? No matter what awaits you, you will be well-prepared to make any rough terrain your own thanks to the PRO TREK.
Experience for yourself how PRO TREK opens up new horizons while always pointing you in the right direction!
Tough Solar. The CASIO Tough Solar System is now so advanced that even the weakest light sources are sufficient to operate the watches. The solar cells are so small and inconspicuous that they can be integrated easily into every watch face design.
An accumulator in solar watches saves “superfluous” energy and releases it when the watch is in darkness. The accumulator is charged automatically and does not require manual activation.
Triple Sensor. PRO TREK watches are equipped with the latest Triple Sensor, version 3 technology, making them even more accurate than before. Three highly sensitive, extremely small sensors measure with absolute precision and instantly display changes in your environment. The precision of the digital compass, altimeter, barometer and thermometer is only possible with the Triple Sensor technology. At the same time, the three layer sensor is 95% smaller and consumes 90% less energy than before.
Altimeter. For all those who set their sights high
The built-in altimeter uses a pressure sensor to measure the current air pressure.
The measured air pressure is then used to provide an “estimate” of the current altitude.
The electronic mechanism in the watch is pre-programmed with “ISA values” (“International Standard Atmosphere”) used to convert pressure values into altitude values.
The air pressure and temperature generally become lower as the altitude increases.
These values define the connection between altitude, air pressure and temperature.
Barometer. The barometer measures the air pressures and displays tendencies in the weather.
The higher a person goes (ascent/terrain), the lower the barometric pressure will be.
An increase in air pressure usually signifies an improvement in the weather.
A decrease in air pressure usually means that bad weather is on its way.
The air pressure is displayed with an accuracy of 1 hPa (hectopascals).
The barometer can measure and display a range from 260 hPa to 1100 hPa.
The PRO TREK digital compass shows 16 compass points. The direction of magnetic north and the bearing are calculated by the compass’s directional sensor The directional sensor consists of two rectangular coils that detect slight tensions created by the earth’s magnetic field. Depending on the position and direction, these tensions vary in intensity. There is a non-magnetic resistance between the two coils, which absorbs the subtle changes in tension. With each new position, the values that are measured by the resistance change. A microprocessor converts the measurements so that they can be displayed clearly on your watch.
Thermometer. The thermometer is used to measure the outside temperature.
The temperature is displayed with an accuracy of 0.1 °C.
The thermometer can measure and display a range from -10.0°C to 60.0°C.
The watertightness of the CASIO watches complies with DIN 8310 and ISO 22810. These standards describe the various classes of watertightness and the test procedure used to determine watertightness.
These standards apply to the general wristwatch usage. Watches with metre indications for watertightness cannot be used immediately in this water depth, however, as water resistance metre indications are merely a pictorial representation of the test pressure. A wristwatch withstands the impact of water at the static pressure specified on the watch (e.g. 10 bar) and the theoretical immersion in water to the specified depth.
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You ask, we answer…
CASIO’s original solar-charging system converts not only sunlight but also light from fluorescent lamps and other sources into power.
It’s the electronic mechanism that “estimates” the altitude based on the air pressure.
It measures and displays direction as one of 16 points.
Giving you a constant overview: Elements on the display are distinguished from one another using colour. This is achieved using different coloured layers placed on top of one another, allowing information to be displayed more clearly.
Can’t find a ProTrek of your dream? There are more watches!