G-Shock & Pro Trek / Review
Casio Pro Trek PRW-61 review: the lightest solar-atomic sensor watch Casio makes, and what 100 m means
Sixty-two grams, a solar cell that never meets a cable, radio-set time, and a compass, barometer and altimeter with accuracy Casio publishes. Reviewed from the module 5673 guide, with the trade against a G-Shock spelled out.
By Mike M.Updated Researched from the maker's manuals and spec sheets
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Our top pick
Casio Pro Trek PRW-61
Tough Solar (~6 months dark), radio time (JJY, WWVB, MSF, DCF77, BPC), triple sensor, double LED, 62 g, 14.7 mm, 100 m, -10°C. Score below.
#ad · Price as of November 12, 2026 · Disclosure for the link to Casio Pro Trek PRW-61
Quick picks
The watch and its alternatives
| # | Product | Best for | Score | Price |
|---|---|---|---|---|
| 1 | Casio Pro Trek PRW-61 Tough Solar (~6 months dark), radio time (JJY, WWVB, MSF, DCF77, BPC), triple sensor, double LED, 62 g, 14.7 mm, 100 m, -10°C. Score below. | The watch under reviewSolar, no charger | 9.6 /10 | |
| 2 |  Casio Pro Trek PRG-340 Solar, Triple Sensor v3, 54 g, 100 m, no radio time; 27 months in power save. | Alternative: the cheaper oneSolar, no charger | 9.5 /10 |
#ad · Prices come live from Amazon, last checked November 12, 2026. Scores are ours, built from the makers' manuals, battery tables and spec pages. Product photos come from Amazon; anything still on a stock frame is labelled on its card. Tap a row for the full write-up.
Verdict and score
What it is built for
Hiking, plainly. Casio's Pro Trek line takes the triple sensor and Tough Solar of the Master of G G-Shocks and puts them in a lighter, thinner case with a cleaner dial and a lower water rating. The PRW-61 adds the radio time calibration the cheaper PRG-340 lacks, and Casio's biomass plastics for the case. On the Pro Trek rankings it is first; on the multi-brand hiking rankings it is the no-GPS pick.
Power and time, from the guide
"Solar panel and one rechargeable battery." Approximately 6 months of operation under Casio's listed conditions (1.5 seconds of illumination and 10 seconds of beeper a day, 20 compass operations and monthly altitude readings). Time calibration signals JJY (40/60 kHz), WWVB (60 kHz), MSF (60 kHz), DCF77 (77.5 kHz) and BPC (68.5 kHz), which covers Japan, the US, the UK, Germany and China. Accuracy ±15 seconds a month when reception is not possible. New Atlas reports Casio's figures of six months without solar charging and 25 months with the power-saving function.
Sensors and accuracy
Direction sensor within ±10°, guaranteed 10 to 40°C. Pressure sensor within ±3 hPa, altimeter within ±75 m, guaranteed -10 to 40°C. Temperature sensor within ±2°C, guaranteed -10 to 60°C. Compass calibration, magnetic declination correction, an altimeter with memory, a barometric pressure graph, 29-city world time, five alarms. A double LED: a light for the dial and a backlight for the LCD, with Full Auto Light, Super Illuminator and a 1.5 or 3 second afterglow. The sensor set is the Rangeman's; the ABC watch explainer covers how to use it.
Durability and what fails first
51.0 × 47.4 × 14.7 mm, 62 g, 100 m, low-temperature resistance to -10°C, a case of biomass plastics made from castor seed and corn per Casio's announcement, a mineral crystal. No mud-resistant button construction. For rain, fords and swims it is fine; for a bog or a sandstorm the Mudman GW-9500 is the sealed version.
Who should skip it
Anyone who submerges or buries their watch: a Mudman or Rangeman, per Pro Trek vs G-Shock. Anyone who does not need radio time and wants to spend less: the PRG-340. Anyone who wants a recorded track: a Garmin Instinct, per G-Shock vs Garmin Instinct.
In detail
Spec sheet and score
The watch under review
Casio Pro Trek PRW-61
Tough Solar (~6 months dark), radio time (JJY, WWVB, MSF, DCF77, BPC), triple sensor, double LED, 62 g, 14.7 mm, 100 m, -10°C. Score below.
EvidenceResearched · every row sourced
| Power class | Solar, no charger. A solar cell that recharges from any light and never meets a charger. The rechargeable cell is a watchmaker-replaceable part. |
|---|---|
| Battery (cell) | Approximately 6 months with no light (Casio's stated usage conditions) |
| Power | Solar panel and one rechargeable battery |
| Bezel & case | Biomass plastics case |
| Water rating | 100 m |
| Sensors | Direction, pressure/altitude and temperature sensors; radio time calibration (JJY, WWVB, MSF, DCF77, BPC); double LED light |
| Weight | 62 g |
| Size | 51.0 × 47.4 × 14.7 mm |
| Operating temp | Low-temperature resistance to -10°C (14°F) |
What the 9.6 score weighs
- Battery & power independence (25% of the score)
- Durability of materials (25% of the score)
- Serviceability & lifespan (20% of the score)
- Field usability (15% of the score)
- Value per decade (10% of the score)
- Mission fit (5% of the score)
What the spec sheet supports
- Solar, atomic and triple sensor at 62 g and 14.7 mm.
- Cleaner dial and a proper altimeter graph for hikers.
Good to know
100 m and no mud-resistant buttons; it is a hiking watch, not a Mudman.
#ad · Price as of November 12, 2026 · Disclosure for the link to Casio Pro Trek PRW-61
Alternative: the cheaper one
Casio Pro Trek PRG-340
Solar, Triple Sensor v3, 54 g, 100 m, no radio time; 27 months in power save.
EvidenceResearched · every row sourced
| Power class | Solar, no charger. A solar cell that recharges from any light and never meets a charger. The rechargeable cell is a watchmaker-replaceable part. |
|---|---|
| Battery (cell) | Up to 7 months while used, up to 27 months in power save, with no light |
| Power | Tough Solar |
| Bezel & case | Biomass plastics |
| Water rating | 100 meters |
| Sensors | Triple Sensor Version 3: pressure (altimeter/barometer), compass, thermometer |
| Weight | 54 g (urethane band) |
| Size | 54.7 × 51.7 × 15.1 mm |
What the 9.5 score weighs
- Battery & power independence (25% of the score)
- Durability of materials (25% of the score)
- Serviceability & lifespan (20% of the score)
- Field usability (15% of the score)
- Value per decade (10% of the score)
- Mission fit (5% of the score)
What the spec sheet supports
- Twenty-seven months in power-save mode is the longest stated figure of any Casio here.
- Lightest triple-sensor watch on the site at 54 g.
Good to know
No Multi-Band 6; you set the time yourself.
#ad · Price as of November 12, 2026 · Disclosure for the link to Casio Pro Trek PRG-340
The bottom line
Our recommendation
Buy this one
Tough Solar (~6 months dark), radio time (JJY, WWVB, MSF, DCF77, BPC), triple sensor, double LED, 62 g, 14.7 mm, 100 m, -10°C. Score below.
#ad · Price as of November 12, 2026 · Disclosure for the link to Casio Pro Trek PRW-61
How we scored this
What we checked to build this ranking
Every pick here is researched against the documents that decide whether a watch lasts: the maker's own battery table read mode by mode, what the lens and case are actually made of, the water rating, whether a MIL-STD-810 line is on the record and in whose words, and how long the maker keeps updating the line. Each one is then scored on a public rubric weighted for a decade of ownership, and every figure links to where it came from.
That is why the order on this page is worth following: it is built from specs you can open yourself, and commissions never set a score or decide a pick. The rubric and its weights are published.
Questions
Frequently asked
Is the Casio Pro Trek PRW-61 solar?
Yes. Casio's guide lists a solar panel and one rechargeable battery, rated about 6 months under its usage conditions with no light.
Does the PRW-61 have a compass?
Yes: a direction sensor accurate within ±10°, plus a pressure sensor (altimeter and barometer) and a thermometer, all with stated accuracy in Casio's guide.
Is the Pro Trek PRW-61 waterproof?
Casio's announcement lists 100 m water resistance. It has no mud-resistant button seals; the G-Shock Master of G models do.
Keep reading
Related on Bezel & Bearing
Receipts
Sources
- Casio — Operation Guide, module 5673 (Pro Trek PRW-61), Specifications (checked 2026-09-20)
- New Atlas — Casio Pro Trek PRW-61 announcement (size, weight, water rating, battery) (checked 2026-09-20)
- G-Central — Pro Trek PRG-340 announcement (size, weight, water rating, battery) (checked 2026-09-20)
Battery, glass, case and water figures come from the maker's own owner's manuals, spec pages and press releases, linked on every product so you can open the page they came from. Prices are set by Amazon and change often, so each buy button takes you to the current one. Read the full method.