PRW-3510 / 3500 SERIES

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.



Triple Sensor, Ver.3

Miniature built-in sensors take highly accurate readings of direction, atmospheric pressure/temperatures and altitudes and indicate the measurement values with an analogue hand and LCD. They detect changes in natural phenomena immediately to support users in making appropriate responses.

Tough Solar

This proprietary CASIO solar-powered battery-recharging system assures stable operation of various power-hungry functions, including dial lighting, alarms, stopwatches and measurement functions.

Multi Band 6

This radio-controlled timekeeping technology can receive standard time-calibration signals from all 6 transmission stations worldwide and correct the time for the North American, European, Chinese and Japanese regions.

Auto Light Switch

For quick, easy data confirmation, even in the dark or with both hands occupied. You need both hands for many outdoor activities, and you don't always have one free to illuminate your watch face in low-light conditions. The Auto Light Switch solves this problem by illuminating the light whenever you turn your wrist to bring the watch into the viewing position.

STN LCD Panel [PRW-3510]

Display visibility has been improved by adoption of a dot matrix STN LCD panel. A hand retraction function is also installed to prevent overlapping hands from obstructing the LCD in the Timekeeping mode by temporarily retracting the hands from above the LCD.

Sunrise, sunset time display

Knowing the time remaining before sunset helps you to schedule climbs to assure a safe descent, or to determine the appropriate time to wake up or pitch a tent.

Atmospheric pressure tendency alarm

An atmospheric pressure tendency alarm has been installed to alert wearers to any notable change.

World time for 48 cities including Kathmandu, Nepal

200-meter water resistance for various outdoor activities

Low-temperature Resistant (–10°C/14°F)


Sapphire crystal

An abrasion-resistant sapphire crystal assures a clear view of the dial at all times.

Large direct buttons

Designed for quick measurement with a single push, the buttons can be operated without taking gloves off.

Field composite band [PRW-3510FC]

This band is made of urethane components that have metal inserts, and fine resin components. A double-lock buckle has a slide adjustment mechanism.

Register ring

A register ring for easy recording of target directions is installed, further underscoring outdoor-gear styling.

Dura-soft band [PRW-3510/3510Y]

Despite the bands soft feel that made by silicon, it remains highly resistant to tearing and abrasion.

Stainless-steel screws

Large screws are employed to attach the band to the case, reinforcing the strength of the connection.