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 Spec-sheet researched, not worn by us
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The verdict
The watch and its alternatives
Stock photoThe watch under review
Casio Pro Trek PRW-61
Solar, no charger8.1 /10Tough 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.
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- Stock photo
Alternative: the cheaper one
Casio Pro Trek PRG-340
Solar, no charger8.0 /10Solar, Triple Sensor v3, 54 g, 100 m, no radio time; 27 months in power save.
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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
Stock photoThe 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 · not worn by us
| 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) |
How the 8.1 score breaks down
- Battery & power independence (25%)
- 9
- Durability of materials (25%)
- 6
- Serviceability & lifespan (20%)
- 9
- Field usability (15%)
- 8
- Value per decade (10%)
- 9
- Mission fit (5%)
- 8
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.
Where it falls short
- 100 m and no mud-resistant buttons; it is a hiking watch, not a Mudman.
- Mineral glass.
Skip this if…
…your watch gets buried in mud or dunked regularly; the G-Shock Mudman is the sealed version of this idea.
#ad · Price set by Amazon · Disclosure for the link to Casio Pro Trek PRW-61
Stock photoAlternative: 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 · not worn by us
| 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 |
How the 8.0 score breaks down
- Battery & power independence (25%)
- 9
- Durability of materials (25%)
- 6
- Serviceability & lifespan (20%)
- 9
- Field usability (15%)
- 7
- Value per decade (10%)
- 10
- Mission fit (5%)
- 7
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.
Where it falls short
- No Multi-Band 6; you set the time yourself.
- 100 m, mineral glass, no mud resistance.
Skip this if…
…you want the time to set itself; the PRW-61 adds radio calibration for the difference.
#ad · Price set by Amazon · Disclosure for the link to Casio Pro Trek PRG-340
How we scored this
Watches we claim to have worn or tested: 0
Plenty of sites say they took every watch up a mountain. We didn't, and we say so. What we do instead: read the maker's own battery table mode by mode, check what the lens and case are actually made of, note the water rating and whether a MIL-STD-810 claim exists, ask how long the maker keeps updating the line, and score every pick on a public rubric weighted for a decade of ownership. Every figure links to where it came from.
Scores are editorial judgments from that documented research, not test results. 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)
We don't own or wear-test these watches and we don't pretend to. Battery, glass, case and water figures come from the maker's own owner's manuals, spec pages and press releases (linked on every product), and where a figure isn't published we say so. Prices are set by Amazon and change often, so we don't print them. Read the full method.