Casio Pro Trek PRG-340 Triple Sensor Solar Watch

Overview of the Casio Pro Trek PRG-340 Triple Sensor Watch | PRG340

The Casio Pro Trek PRG-340 is a no-compromise outdoor tool watch built for the field, the trail, and every environment in between. Law enforcement officers, search and rescue teams, military personnel, and serious outdoor adventurers turn to this series when real environmental data needs to be right and readable in a hurry.

What makes it different: The PRG-340 uses a duplex LCD that places compass graphics on a separate display layer from the clock and measurement data. The result is a larger, clearer compass bearing display in the field without enlarging the case. Pair that with one-button access to each sensor and oversized, textured buttons that work with gloves on, and you have a watch that performs under pressure.

The case, case back, and urethane band are built from bio-based resin derived from castor oil and corn, cutting petroleum dependence without sacrificing trail-ready toughness. Three variants cover every mission:

• Black (PRG-340-1): Bio-resin case and band with bold red compass accents
• Green (PRG-340-3): Tactical olive/khaki case and band with yellow and orange accents
• Silver (PRG-340T-7): Bio-resin case paired with a titanium link bracelet

All three run on Tough Solar and carry a 10-bar (100m) water resistance rating. No battery swaps, no dead watch in the field.

Key Features

• Tough Solar Powered: Charges from any light source with approximately 7 months of power reserve in power-saving mode. A battery level indicator keeps you informed at all times.
• Triple Sensor Suite: Digital compass, altimeter/barometer, and thermometer, each accessible via a dedicated side button labeled COMP, BARO, and ALTI for one-push access.
• Duplex LCD: Dual-layer display places compass graphics on the top layer and clock/data on the bottom, delivering a wider, more legible compass readout without a larger case footprint.
• Digital Compass: 16-point direction readout (0 to 359°), 60-second continuous measurement, graphic direction pointer, bidirectional calibration, magnetic declination correction, and bearing memory.
• Altimeter: Measuring range of -700 to 10,000m (-2,300 to 32,800 ft.) with 1m (5 ft.) resolution, 30-record manual memory, auto log of high/low altitudes, trek log (up to 14 records), and selectable 5-second or 2-minute measurement intervals.
• Barometer: Range of 260 to 1,100 hPa (7.65 to 32.45 inHg) with a 42-hour atmospheric pressure tendency graph, differential pressure graphic, and a pressure tendency alarm that alerts you to significant incoming weather changes.
• Thermometer: Reads ambient temperature from -10 to 60°C (14 to 140°F) with 0.1°C (0.2°F) resolution, switchable between Celsius and Fahrenheit.
• Rotating Bezel: Lock in a compass bearing for quick directional reference without re-entering a menu.
• Movable Lug Construction: The watch lies flat against a paper topographic map so you can mark your exact position without removing it from your wrist.
• Glove-Compatible Buttons: Oversized, textured side buttons with a nonslip finish operate cleanly even with work gloves or tactical gloves on.
• Low-Temperature Resistance: Fully operational down to -10°C (14°F), keeping sensors and display active in cold-weather environments.
• 10-Bar (100m) Water Resistance: Safe for swimming, rain, river crossings, and heavy field use.
• Super Illuminator Full-Auto LED Backlight: High-brightness LED activates automatically when you tilt the watch toward your face in low light.
• Sunrise/Sunset Time Display: Useful for mission planning, patrol scheduling, hunting windows, and backcountry timing.
• 1/10-Second Stopwatch: Up to 999 hours, 59 minutes, and 59.9 seconds with elapsed, split, and 1st/2nd place timing modes.
• Countdown Timer: 60-minute countdown with auto-repeat capability.
• 5 Daily Alarms: One alarm includes a snooze function; hourly time signal also included.
• 48-City World Time + UTC: Covers 48 world cities for multi-timezone tracking across deployments and travel.
• Full Auto-Calendar: Pre-programmed to the year 2099. 12/24-hour format switchable.
• Accuracy: ±15 seconds per month.
• Quick-Release Band Bars: Tool-free strap swaps for easy replacement or customization.
• Bio-Based Resin Construction (Black and Green): Band uses biomass plastic derived from corn; case and case back use bio-based resin derived from castor oil. The Silver variant uses a titanium link bracelet instead of the urethane band.

Specifications

Variant Details: SKUs, MPNs, UPCs, and Band Information

Compatibility

The Casio Pro Trek PRG-340 fits a wide range of wrist sizes. The Black (PRG-340-1) and Green (PRG-340-3) variants use a bio-based urethane band with a standard pin buckle closure. The Silver (PRG-340T-7) titanium bracelet is adjustable via link removal to fit wrists from 145 to 215mm (approximately 5.7 in. to 8.5 in.) and uses a one-touch 3-fold deployant clasp with Casio and Pro Trek engravings.

All three variants use quick-release spring bars for tool-free strap swaps, making them compatible with aftermarket replacement bands from Casio or third-party manufacturers. The movable lug construction allows the watch to lie flat for use alongside paper topographic maps, which is a notable advantage over fixed-lug designs.

The mineral crystal lens does not include anti-reflective coating. The compass function requires the watch to be held level and positioned away from magnetic interference sources such as electronics, metal belt hardware, or vehicle bodies for accurate readings. This watch does not have GPS, atomic timekeeping, or Bluetooth connectivity.

Intended Users

Law enforcement and military personnel use the PRG-340 as a field-ready wrist instrument for land navigation and patrol operations. The digital compass with bearing memory and magnetic declination correction supports accurate heading work in areas where GPS is unavailable or compromised. The glove-compatible buttons and rotating bezel make the watch fully functional in tactical gear without taking hands off a firearm or equipment.

Search and rescue teams and first responders benefit from the altimeter, barometer, and 42-hour pressure tendency graph, which together provide early warning of deteriorating weather in remote environments. The pressure tendency alarm gives an audible alert when atmospheric pressure changes signal incoming weather. The sunrise/sunset display and five-alarm system support time-critical scheduling across multi-day operations.

Preppers, survivalists, and serious hikers rely on the combination of solar power and a 7-month power reserve to eliminate battery dependency on extended trips. The trek log records high and low altitudes across up to 14 separate treks, and the watch operates at temperatures as low as -10°C (14°F), well below the range where most standard watches become unreliable.

Outdoor professionals and enthusiasts including park rangers, wildland firefighters, hunters, backcountry skiers, and mountaineers will find the PRG-340 a lightweight, self-sufficient data tool at roughly 54 grams with the urethane band. It delivers accurate environmental readings independently of any smartphone, network, or satellite signal.

What's Included

• 1x Casio Pro Trek PRG-340 Watch (choose Black, Green, or Silver at checkout)
• 1x Original Casio box and packaging
• 1x Casio watch operating manual

Note: No bracelet link removal tool is included with the Silver (PRG-340T-7) variant. A standard watch pin punch or similar tool is required for bracelet size adjustments and is not included.

Available at WCUniforms

WCUniforms is a specialty retailer focused on uniforms, tactical gear, and public safety equipment, serving law enforcement, military, EMS, firefighters, security professionals, and civilians across the United States. The Casio Pro Trek PRG-340 ships directly from our Michigan facility, so you get fast, reliable delivery without the uncertainty of marketplace sourcing or gray-market product.

Unlike smartwatches that demand daily charging and require a paired phone to function fully, the PRG-340 runs for months on solar power and delivers every reading independently, anywhere in the world without a signal. Shop with confidence at wcuniforms.com.