Casio · Pro Trek · Ref PRW-B1000-1
Sapphire, radio, Bluetooth and the sensors, in 45.8mm.
The first Pro Trek to put Tough Solar, Bluetooth and the full Triple Sensor in one case, and the only one in Casio’s US range with a sapphire crystal. It sets itself from a radio tower or a phone, and it is narrower on the wrist than any other Pro Trek here.
Charge & run
Only sapphire Pro Trek in Casio’s US range
Bio-based resin, steel bezel
Casio product page
Full charge, no light; ~25 months power saving (G-Central)
Casio product page
G-Central
Two ways to set itself
Multi-Band 6 listens for one of six time-signal transmitters around the world and corrects the watch overnight. Bluetooth does the same job from a phone, anywhere there is no tower in range. Between them, the PRW-B1000 is never set by hand.
The phone link also does things a radio cannot: it logs a route from the phone’s GPS, stores locations, and shows sunrise and sunset for wherever you are. Casio lists world time across 38 zones as well.
The octagon
Most Pro Treks are round. This one wears an octagonal ion-plated steel bezel with four exposed screws over a case moulded from flame-retardant bio-based resin, so it looks more like Casio’s square-bezel G-Shocks than like its own family.
The bezel is the reason the crystal can be sapphire with an anti-reflective coating rather than the mineral glass on every other US-market Pro Trek. Under it sits an analogue-digital dial with a small compass sub-dial and an LCD window.
Narrower, heavier
Casio lists the case at 50.8mm long, 45.8mm wide and 14.9mm thick. That width is several millimetres less than the PRG-270, the PRG-340 or the PRW-3500T, so it sits within a normal wrist rather than across it.
The steel bezel and the denser build bring the weight to 79 grams, heavier than the resin Pro Treks despite the smaller footprint. The strap is Casio’s Duro Soft rubber reinforced with cellulose nanofibre. Water resistance is 100m.
Specs
- Reference
- PRW-B1000-1
- Case size
- 50.8 × 45.8 × 14.9mm
- Case material
- Bio-Based Resin / Stainless Steel
- Movement
- Tough Solar (Solar Quartz), Radio-Controlled
- Caliber type
- Tough Solar Quartz, Multi-Band 6 + Bluetooth
- Crystal
- Sapphire with Anti-Reflective Coating
- Water resistance
- 100m (10 ATM)
- Power reserve
- Tough Solar (Rechargeable)
- Complications
- Triple Sensor (Compass, Altimeter/Barometer, Thermometer), Multi-Band 6 Radio, Bluetooth Time Sync, Screw Lock Crown
- Origin
- Casio (Japan)
Specifications as published by Casio. We research from manufacturer documentation and published sources rather than hands-on testing. Researched 2026-09-03.
Verdict
The most complete Pro Trek in a wearable width: sapphire, radio and Bluetooth sync, Triple Sensor and solar power in a 45.8mm octagonal case.
Strengths
- Sapphire crystal with anti-reflective coating
- Sets itself by Multi-Band 6 radio or Bluetooth
- Full Triple Sensor plus route log, sunrise and sunset
- Narrowest case of the Pro Treks on this site at 45.8mm
Trade-offs
- 79 grams, heavier than the resin models it is smaller than
- 100m rating rather than the PRW-3500T’s 200m
- Octagonal steel bezel is a style choice you have to like
- The dearest Pro Trek in this catalogue
Buy it if
Hikers and travellers who want a Pro Trek that never needs setting, with a crystal that will not scratch, in a case that fits under a jacket cuff.
Skip it if
You need 200m water resistance, the lightest possible watch, or the lowest price. The PRW-3500T and PRG-340 are the respective answers.
FAQ
Yes. It uses a sapphire crystal with an anti-reflective coating, which makes it the only Pro Trek in Casio’s US line-up with sapphire rather than mineral glass.
Sources
- Casio Pro Trek PRW-B1000-1, Casio US product page
- Pro Trek PRW-B1000 release specifications, G-Central
Researched and last updated 2026-09-03. We do not test watches in hand; every figure above is traceable to the manufacturer or the sources listed here.
Casio Pro Trek PRW-B1000-1
Reference PRW-B1000-1 · $500–$1,000
Prices and availability change; the band above is a research figure, so check the current listing.
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