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Casio Pro Trek PRG-340
#16 — Best Lightweight ABC Watch

Casio Pro Trek PRG-340 Review (2026)

Triple sensor and solar at under two ounces

★★★★★
8.6/10
Reviewed by William • Updated August 2026 $200

The Pro Trek line is Casio's hiking-specific range and the PRG-340 is the sensible weight-conscious entry. You get the same triple sensor set as the Rangeman — altimeter, barometer, compass — plus solar charging, in a resin case weighing 1.7oz rather than 3.1oz. It fits under a jacket cuff, which the Rangeman does not. The trade-offs are durability and radio sync: it is tough but not G-Shock tough, and this model relies on manual time setting rather than atomic reception.

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$200 retail
TrailCraft Score

What Works

  • 1.7oz — half the weight of a Rangeman
  • Full triple sensor with solar charging
  • Fits comfortably under a jacket or shell cuff
  • Sunrise and sunset data for trip planning
  • $200

Limitations

  • Not G-Shock durable
  • No atomic radio sync on this model
  • Resin case scuffs more readily
  • No GPS or track recording

At a Glance

TypeSolar ABC digital
SensorsAltimeter, barometer, compass, thermometer
PowerTough Solar
Water resistance100m
Weight1.7oz / 48g
ExtrasSunrise/sunset data
WarrantyCasio limited

Score Breakdown

Value for Money
9.0
Battery Life
9.8
Durability
8.4
Navigation
6.4
Readability
8.6

What Sets It Apart

Cuff clearance matters more than people expect. A thick watch under a rain shell either does not fit or rides up the forearm all day, and the Rangeman is genuinely too tall for many cuffs. The PRG-340 slides under without a fight, which is why it ends up on more actual hikes.

Triple sensor and solar at under two ounces

Who This Is For

Weight-conscious hikers who want sensors, anyone whose watch fights their jacket cuff, and buyers wanting Pro Trek function under $250.

Note: Prices are current as of August 2026. Some links are affiliate links.

Also Consider

See the full comparison

All 30 options in this category ranked side by side.

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Common Questions

Pro Trek or Rangeman?
Rangeman for maximum durability and atomic sync. Pro Trek for half the weight and a slimmer profile.
Is the compass accurate?
Adequate for general orientation after calibration. For precise bearings, a proper baseplate compass remains more reliable.