For many people, something from the Casio ProTrek can be a bit of overkill. However, if you spend a lot of time outdoors – be it camping, hiking, fishing, or whatever – they pack in a lot of capability that can helpful. Most outdoorsy folks also tend to be a bit more eco-conscious. This means that the Casio ProTrek PRG340SC is going to be hitting a very particular sweet spot.

  • Casio ProTrek PRG340SC
  • Casio ProTrek PRG340SC
  • Casio ProTrek PRG340SC
  • Casio ProTrek PRG340SC

Eco-friendly how, exactly?

Well, for starters, there’s no recycled materials here. At least in the sense that we normally think of those when it comes to watches. The case, bezel, and case back are made of a bio-based resin, something we’ve seen on other Casio models. The strap, that’s where something special happens.

Instead of creating the strap from a brand-new shot of resin, it instead uses leftover resin scraps. These are chopped up, and then used to form the new band. This keeps those scraps from ending up in the landfill, as well as giving a very unique pattern to the straps on the watch.

  • Casio ProTrek PRG340SC
  • Casio ProTrek PRG340SC
  • Casio ProTrek PRG340SC

Casio ProTrek PRG340SC: the tech-y stuff

You know when you get into a ProTrek, there is a LOT of capability stuffed into the case. For all of the nitty-gritty, go ahead and look at the tech specs down below. First things first – this of course has Altimeter-Barometer-Compass (ABC) capability. Along with those, you get a thermometer readout (just take it off your wrist to get an accurate air temp reading).

To run all of that capability, you have solar cells in there, which is fitting for an outdoors-oriented watch. You can also track world time, sunrise and sunset times, stopwatches and timers, and calendars. In short, if you can think of a capability you’d want a digital watch to have, this watch is going to have it.

  • Casio ProTrek PRG340SC
  • Casio ProTrek PRG340SC

Wrapping things up

About the only thing we can think that the Casio ProTrek PRG340SC might be possibly missing is the inclusion of a HR monitor and step tracking. Then again, if it had those, you wouldn’t have a watch that runs just $280. This is a watch that is going to keep up with you, no matter what the outside activities are you’re bumping around in. If you want to get one (in one of two colors), head on over to

Casio ProTrek PRG340SC Tech Specs

  • Case size (L× W× H): 54.7 × 51.7 × 15.1 mm
  • Weight: 60 g
  • Case and bezel material: Resin / Bio-based resin
  • Band: Silicon band
  • Water resistance: 100-meter water resistance
  • Environmental resistance: Low-temperature resistant (-10?/14?)
  • Power supply and battery life: Solar powered
  • Sensor feature
    • Altimeter 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)
    • Barometer 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 indicate significant changes in pressure) *Changeover between hPa and inHg
    • 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 Bidirectional calibration Magnetic declination correction Bearing memory
    • Thermometer Display range: -10 to 60? (14 to 140?) Display unit: 0.1? (0.2?) *Changeover between Celsius (?) and Fahrenheit (?)
  • Glass: Mineral Glass
  • Bezel features: Direction Bezel
  • Compatible band size: 145 to 215 mm
  • Features
    • World time: World time 31 time zones (48 cities + coordinated universal time), daylight saving on/off
    • Sunrise/sunset display: Sunrise, sunset time display Sunrise time and sunset time for specific date
    • Stopwatch: 1/10-second stopwatch Measuring capacity: 999:59’59.9” Measuring modes: Elapsed time, split time, 1st-2nd place times
    • Timer: 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)
    • Alarm/hourly time signal
      • 5 daily alarms (with 1 snooze alarm)
      • Hourly time signal
    • Light
      • LED backlight (Super Illuminator) Full auto LED light, selectable illumination duration (1.5 seconds or 3 seconds), afterglow
      • Light color
      • LED:White
    • Calendar: Full auto-calendar (to year 2099)
    • Mute feature: Button operation tone on/off
    • Energy saving feature: Power Saving (display goes blank to save power when the watch is left in the dark)
    • Battery display/alert: Battery level indicator
    • Run time: Approx. battery operating time: 7 months on rechargeable battery (operation period with normal use without exposure to light after charge) 27 months on rechargeable battery (operation period when stored in total darkness with the power save function on after full charge)
    • Accuracy: ±15 seconds per month
    • Other features
      • 12/24-hour format
      • Regular timekeeping: Hour, minute, second, pm, month, date, day
      • Duplex LC display

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Last Update: June 13, 2024