Casio introduced the first PRO TREK watch in 1994, and it arrived with a genuine first: Triple Sensor technology that measured compass bearing, altitude, and barometric pressure from the wrist, all in one case. The line quickly became a fixture among Japanese climbers and hikers, and every PRO TREK since has followed the same basic template — sensors, solar power, and a rugged build aimed at people who actually leave cell service.
This PRG-340-1JF carries that template into modern materials: the case and back cover are molded from castor-oil-derived biomass plastic, the band from corn-derived biomass plastic, and a duplex LCD splits the compass display from the clock function for easier reading outdoors. Tough Solar charging and a rotating bezel for simple azimuth memory round out a watch built to actually be used on trail, not just look like it.
