Casio Pro Trek PRG-340

Published · Researched 2026-09-21

MPN: PRG-340 (variants: PRG-340-1 black resin, PRG-340L-5, PRG-340B-3, PRG-340T titanium-band, plus anniversary editions) | Category: ABC sensor watch (solar, non-GPS) | Lineup note: current Pro Trek triple-sensor line; succeeds the PRG-330/270 generation with a slimmer case and duplex LCD. This dossier covers the standard resin PRG-340 family — the PRG-340T (titanium band, ~87 g) is a distinct, pricier variant. Do not confuse with the PRW-3400 (radio-controlled) or the G-Shock Rangeman (different line entirely).

Version lineage (2023–2026)

• Pre-2023: PRG-270/PRG-330 are the long-running Pro Trek triple-sensor standards.
• 2023: PRG-340 launches — duplex LCD, slimmer profile, Tough Solar, ~54 g resin case.
• 2024–2025: Color/band variants expand (PRG-340L-5, PRG-340B-3, PRG-340T titanium); anniversary editions appear.
• 2026: PRG-340 remains the current triple-sensor Pro Trek; no successor announced as of Sept 2026.

Overview

The PRG-340 is the anti-smartwatch: no GPS, no Bluetooth, no charging cable — just a solar-powered triple sensor (compass, altimeter/barometer, thermometer) in a 54 g resin case with a big, readable duplex LCD. Field tests praise the legible display, reliable ABC sensors, and total energy independence — it runs indefinitely on wrist light. The recurring drawback is the case: ~54.7 × 51.7 × 15.1 mm is still a lot of watch, and at this size and price you're pointedly not getting GPS or smart features. It's for hikers who want altitude, bearing, and barometric trend on the wrist without ever thinking about batteries — a philosophy, not a spec sheet.

Key Specs

Pricing

• US MSRP: not confirmed in this pass — UNVERIFIED.
• Street (observed 2026-09-20): later variants (PRG-340L-5, PRG-340B-3) listed around $280–$290 at specialty retailers; standard PRG-340-1 pricing not pinned down — UNVERIFIED.
• Ongoing cost: none.

In the Box

PRG-340 watch, manual, documentation. (Exact bundle contents not exhaustively confirmed — UNVERIFIED.)

Warranty

Casio's standard limited warranty applies (1 year US, per Casio terms). UNVERIFIED — confirm at Casio US.

Support & Parts

• Solar cell means no battery swaps for years; when the rechargeable cell eventually fades, Casio service centers replace it.
• Resin bezel/strap replacements available via Casio parts channels.

Community Verdict

Field-test reviewers and owner threads praise the readable duplex display, the genuinely useful compass/altimeter/barometer, and the freedom from chargers — "put it on and forget it for years" is the recurring theme. The case size draws the consistent complaint: it wears big, especially under cuffs. GPS-watch owners call it a charming anachronism; its fans call GPS watches needy. Both are right — the PRG-340 is for people who've decided a barometer and a bearing are enough.

Images

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Research date: 2026-09-20. Specs cross-verified across Casio published data and retailer listings. Re-verify live: US MSRP, current street price, and exact variant lineup.

Long-term durability & warranty-claim reality (enrichment — Sept 2026)

Pro Treks are famous for decade-plus service lives — the solar cell and simple LCD have almost nothing to fail. Resin cases and straps are the wear items; both are replaceable. No systemic defect pattern in owner communities. The realistic lifespan limiter is the rechargeable cell (typically 7–10+ years before noticeable fade), and Casio service centers still support cells for long-discontinued models — parts availability is a genuine Casio strength.

Version history — year by year (enrichment — Sept 2026)

• 2023: PRG-340 launches (duplex LCD, slimmer case).
• 2024: Band/color variants expand.
• 2025: Anniversary editions; PRG-340T titanium variant in the mix.
• 2026: Current model; no successor announced as of Sept 2026.

Head-to-head vs closest rivals (enrichment — Sept 2026)

• suunto-9-peak-pro: a real GPS multisport watch at 2026 street prices near the PRG-340's — far more capable, needs charging. Choose Suunto for GPS; choose Casio for indestructible simplicity.
• garmin-foretrex-801: wrist GPS with AAA power — the "field instrument" alternative. Choose Foretrex for actual position data; choose PRG-340 for altitude/bearing with zero battery thought.
• silva-ranger-2-0: the analog alternative — a $75 baseplate compass does bearings better than any watch sensor. Many PRG-340 owners carry both.

Care & maintenance (enrichment — Sept 2026)

• Give it window light monthly — a drawer-stored solar watch slowly dies; a windowsill-stored one lives forever.
• Calibrate the compass away from metal; calibrate the altimeter at known elevations for accuracy.
• Rinse after salt exposure; the resin strap lasts longer out of UV when stored.

Buying traps (enrichment — Sept 2026)

• PRG-340T (titanium band, ~87 g) is a different, pricier variant — don't compare its price to resin models.
• Anniversary/limited editions carry premiums for cosmetics — the sensors are identical.
• Grey-market (non-US) models may lack US warranty support — buy from authorized dealers if warranty matters.
• The thermometer measures wrist temperature — take the watch off for 20 minutes for meaningful readings.

Community Verdict — additional voices (enrichment — Sept 2026)

• Long-term owners (5+ years on earlier PRGs) report sensors still accurate — a durability story GPS watches can't match.
• Backpackers who switched from GPS watches cite "one less thing to charge" as the real luxury.
• The duplex LCD gets specific praise from older hikers — no backlight needed, readable without glasses at arm's length.

Key Specs gap-fill (enrichment — Sept 2026)

• US MSRP and standard-variant street price: not confirmed — UNVERIFIED.
• Exact case dimensions: ~54.7 × 51.7 × 15.1 mm reported — UNVERIFIED against Casio's official spec.
• US warranty terms: not confirmed — UNVERIFIED.