Detailed PRW-3500 technical specs are here →
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About PRW-3500 in Short. Functional digital tracks with digital time display. The display is protected by a steel bezel with a rotation function – for convenient use of the compass function [on the bezel there are marks of cardinal points and degree measures of the angle]. The triple sensor [barometer, thermometer, compass] of the new generation has become even more accurate and energy efficient. Solar power and radio time synchronization – an advanced filling to satisfy most of the needs of backpackers. The frost resistance of the case allows using the PRW-3500 not only under the sleeve, but also on top of it – stable operation of the module and display at -20 ° C is guaranteed. Additional features include sunrise and sunset information and a digital base: stopwatch, timer, alarm clock, world clock and calendar.
|Price||330$ *average Amazon Price, we may earn commission from purchases|
|Year of First Release||2015|
|Battery Type||Solar (ProTrek Batteries)|
PRW-3500 Model Range *may be updated
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Official Description from Casio. Triple Sensor Version 3, advanced CASIO original technology that makes it possible to pack sensors 95% smaller than those of previous models into a totally new type of compact PRO TREK. Despite their smaller size, the new sensors in this model provides improved reading accuracy and energy efficiency.
This new Triple Sensor Version 3 model delivers altitude, barometric pressure, and direction readings that are more accurate than previous models. A Barometric Pressure Tendency Alarm alerts the wearer to sudden changes in pressure readings, which can indicate upcoming weather events.
This model is water resistant up to 200 meters and features Full Auto LED display illumination, which makes it a great choice for wet environments and nighttime operations. A stainless steel rotary bezel can be positioned to help you keep track of your current and intended bearings.
In terms of both functions and looks, this Triple Sensor Version 3 provides a choice of outdoor timekeeping gear that can’t be beat.
Official PRW-3500 Specs / Features *for base version PRW-3500-1
- Case / bezel material: Resin / Stainless steel
- Resin Band
- Mineral Glass
- Direction Bezel
- 200-meter water resistance
- LED backlight (Super Illuminator)
Full auto LED light, selectable illumination duration, afterglow
- Solar powered
- Low-temperature resistant (–10°C/14°F)
- Time calibration signal reception
Auto receive up to six* times a day (remaining auto receives canceled as soon as one is successful)
*5 times a day for the Chinese calibration signal
The latest signal reception results
- Time Calibration Signals
Station name: DCF77 (Mainflingen, Germany)
Frequency: 77.5 kHz
Station name: MSF (Anthorn, England)
Frequency: 60.0 kHz
Station name: WWVB (Fort Collins, United States)
Frequency: 60.0 kHz
Station name: JJY (Fukushima, Fukuoka/Saga, Japan)
Frequency: 40.0 kHz (Fukushima) / 60.0 kHz (Fukuoka/Saga)
Station name: BPC (Shangqiu City, Henan Province, China)
Frequency: 68.5 kHz
- Digital compass
Measures and displays direction as one of 16 points
Measuring range: 0 to 359°
Measuring unit: 1°
60 seconds continuous measurement
Graphic direction pointer
Magnetic declination correction
Measuring range: –700 to 10,000 m (–2,300 to 32,800 ft.)
Measuring unit: 1 m (5 ft.)
Manual memory measurements (up to 30 records, each including altitude, date, time)
Auto log data (High/low altitudes, auto cumulative ascent and descent)
Trek log data (up to 14 records of high/low altitudes, auto cumulative ascent and descent of particular treks)
Others: Relative altitude readings (–3,000 to 3,000 m), Selectable measurement interval: 5 seconds or 2 minutes
*1 second for first 3 minutes only
*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(past 42 hours of readings)
Atmospheric pressure differential graphic
Barometric pressure tendency information alarm (beep and arrow indicates significant changes in pressure)
*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)
- World time
31 time zones (48 cities + coordinated universal time), daylight saving on/off
- Sunrise, sunset time display
Sunrise time and sunset time for specific date, daylight pointers
- 1/10-second stopwatch
Measuring capacity: 999:59’59.9”
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 minute to 24 hours (1-minute increments and 1-hour increments)
- 5 daily alarms (with 1 snooze alarm)
- 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 (with no signal calibration)
- Approx battery operating time:
7 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 : 56.9×53.4×14.5mm
- Total weight : 89g
ProTrek PRW-3500 on the wrist!
Feedback from users *accumulated information from our own comments and emails, forum threads, socials, reviews, etc.
+ very accurate compass, works as good as my mechanical compasses
+ nice long strap will fit around wrist of winter gloves
+ temperature sensor can be recalibrated, accurate to 0.1 degrees
+ can be set to metric or imperial
+ several different display modes for date and time
+ functions for long periods on a single day of sun exposure
+ can be set to conserve power when not in use
– ALTIMETER affected by air pressure, so accuracy is more general
– the band is very difficult to remove
– when setting anything on the watch the lower button on the right side increases the value and the higher button decreases it. Very counter-intuitive
– the barometer may skip out regularly often missing stretches of several hours
– the backlight can be set to come on for 3 seconds at most
The most distinctive specs of PRW-3500 *Editorial
— 200-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)
— Radio-controlled Watch; Multi band 6 (additional way for time sync. This watch receives time calibration radio signals that keep the displayed time accurate)
— 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)
— Sunrise/sunset display (After entering the geographical location, sunrise and sunset times can be displayed for any given date)
— Direction Bezel (This bezel can be used to determine approximate directions)
Official PRW-3500 Video
Other ProTrek PRW Watches *similar by price and functions but different by cases
These are not all ProTrek PRW Series. Here is a list of All ProTrek PRW Watches →
PRW-3500 Comparison Table with similar ProTrek Watches
Year of first Release
Radio-controlled (via atomic watch signals)
Radio-controlled (via atomic watch signals)
±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)
LED backlight (Super Illuminator)
Super-Full-Auto LED light (If the ambient light fades, a turn of your wrist illuminates the watch display particularly brightly.)
Full auto LED light, LED backlight (Super Illuminator)
Case / bezel material
Resin / Stainless steel
Resin / Stainless steel
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.
RADIO WATCH TECHNOLOGY.
The advantages of radio-controlled watches are obvious: Once they have been set to the relevant time zone, they always display the exact local time. All CASIO radio watches receive signals almost anywhere in Europe. Some models even receive signals in North America, parts of Canada and Mexico (the radio tower in Fort Collins sends signals for a radius of up to 3200 km) and even in Japan or China. In Europe, the change from summer to winter time is also completely automatic.
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.
Recent News about PRW-3500
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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.
It measures the air pressures and displays tendencies in the weather.
Can’t find a ProTrek of your dream? There are more watches!