Men's Pro Trek PRW3500 Solar Powered Atomic Digital Watch

No messing around changing times, locks in to atomic clock and updates. Solar powered so no need to change batteries. Does exactly what It says on the tin.

Just bought watch. It’s absolutely awesome ⭐️⭐️⭐️⭐️⭐️

Superb Watch - much more legible than others I've had of the same function type from Casio

The Casio PRW-3500 is one of the older models in Casio’s Pro Trek series of hiking watches. I believe it has been discontinued although it is still available for sale. This watch looks basic. It has no fancy graphics, just a digital display reminiscent of the 1980s. It is a solar-powered altimeter–barometer–compass (ABC) watch with a temperature sensor, world time, a stopwatch, a timer and alarms. It cannot connect to your smartphone, play music, count your steps, measure your heartbeat rate, or display your position on a map. If you want these features, this watch is not for you. This watch is for you if you want a rugged ABC watch that does not need recharging. Being digital, it has few moving parts so it is less likely to break down. Besides being solar-powered, it has a huge power reserve since it does not need to drive moving hands or light up an all-colour screen. According to the official specs a full charge is enough for seven months of normal use or 23 months in storage with power-saving on. I cannot verify these figures, but I have owned another Casio digital solar ABC watch (a PRG-270) for more than four years and in all this time it has never run low on power. The downside of the PRW-3500 is its user interface, which is also reminiscent of the 1980s. The basic altimeter, barometer and compass functions are activated by dedicated buttons on the right side of the watch case, so they are easy to use. But most other functions – for instance, calibrating the altimeter, using the timer, or logging ascents – are accessed through a sequence of button-presses that is non-intuitive and must be memorised. This makes such functions hard to use. However, I knew this when I bought the watch because my PRG-270 has a similar interface. The watch supplements a handheld GPS unit that supplies me with much of the information I need on hiking expeditions, so my use of the watch's ABC functions will normally be limited to those I can access with a single button-press (especially the compass) as a convenient alternative to digging into the menu of my GPS. I have used the PRG-270 in this way. It came into its own during a walking expedition in Wales last year, when I was crossing a stretch of boggy terrain with no clear path and no landmarks in filthy weather, and I used the watch to stay oriented in the right direction. The ABC functions do have to be used with a degree of caution. The watch compass sensor is accurate to within plus or minus ten degrees, so you may need a more accurate compass if you have to follow a precise bearing. Having said this, however, an approximate bearing is often enough. It has been so in all the scenarios in which I have needed a compass bearing, including my Welsh bog-traversing episode. The altimeter has to be calibrated often with reference to known altitudes at particular locations so as to take account of changes in air pressure due to weather. The temperature sensor works well only when the watch has been off your wrist for 20 to 30 minutes since – quite understandably – it would otherwise be affected by your body temperature. However, these issues apply to any ABC watch. The first thing I did when I received my PRW-3500 was to remove the resin watch band and replace it with a one-piece nylon “NATO” strap. The resin band is by no means uncomfortable, but if you have skinny wrists like me you will be left with a lot of extra length to catch on your sleeve and irritate you. With a nylon strap you can tuck the extra length inside the retainers. Also, the tongue on the resin band has a raised area which is intended to stop it slipping off but which makes taking off the watch awkward (first photo). Removing the resin band is relatively easy thanks to the screws on the watch lugs. 22-millimetre nylon straps make a perfect fit as long as they are not the heavy-duty type, which is too thick to pass through the gap between the pins and the watch body. Heavy-duty straps are overkill, however. Thinner straps are still tough and I have never had one fail on me. The PRW-3500 measures 56.9 × 53.4 × 14.5 mm, which makes it a big watch. However, it does not look as massive as these measurements would suggest. The watch face is dominated by its rotating bezel or ring, which is only 46 mm in diameter – barely larger than many men’s watches. The watch does not overwhelm my wrist, although its height is noticeable when seen from the side (second and third photos). The bezel has a practical use as a means to remember the bearing you have to follow if you are navigating by the watch compass. Aim the watch so the 12 o’clock position points in the direction you want to go, then rotate the bezel to align north on the bezel with north on the display. The bezel has just the right amount of resistance: it turns easily, but not so easily that it will turn on its own from contact with your sleeve. The raised segments on the bezel give you added grip when turning it with gloves on. Strictly speaking, the bezel is redundant because the watch compass has a bearing memory function that displays both your desired and actual bearing (fourth photo). However, I find the bezel simpler and easier to use. The PRW-3500 can calibrate its time-keeping to the second using radio signals transmitted from stations in England, Germany, China, Japan and the US, if they are in range. This feature is sometimes called atomic time since the transmitting stations keep time using atomic clocks. However, I do not live within range of any station so this feature is of no use to me. The PRW-3500 should keep time accurately even without radio calibration if the PRG-270 is anything to go by. I last set the time on my PRG-270 years ago (both models have a DST on-off feature and world time, so you don’t need to reset the time for summer or winter or if you travel), yet it has gone off track by no more than twenty seconds over all this period. Casio seems to be gradually phasing out the digital watches in its Pro Trek range in favour of analogue models. Its most recent models are battery-powered because they come with smart features that are too energy-hungry for solar power. This might make solar-powered digital hiking watches like the PRW-3500 a thing of the past, which would be a pity. Such watches display ABC information much more clearly than analogue models and they thrive on neglect, unlike smart watches. I have had my eye on the PRW-3500 as an eventual replacement for my PRG-270, so I decided to get it now while it is still available.

Excellent delivery timing, good size package, good quality for the price. Excellent seller. Whoever wants something like this the best choice to buy, highly recommended.

Exactly the watch that I wanted with the 20bar depth, good looks and solar powered. Basically, the same as the other Protreks north of $600 or even north of $1000. Very quick delivery too

Received watch in good packaging. Casio watch is known for its durability and economical price. Shld be able to last long.

Can not be any better for the price!

If you want a dead-on serious exploration watch this is the one for you. I found the Casio Pro Trek watches to be excellent. I like how the buttons work, and the way they are placed. The bezel moves in both directions. I was reading some specs were indicating one direction only, as like with a diving watch. This is not a diving watch. The accuracy for the altitude for something you can wear on your wrist is impressive. Most of these watches the altitude is in 5 meter increments. On this one it is in 1 meter increments which is interesting. The compass and the barometer are also very accurate. I verified the accuracy against known calibrated references. Remember the altitude reading works by atmospheric pressure. The reference can change often. Over time barometric pressure is changing. Time keeping is in the range of 5 to 8 seconds per month as like most of the watches in this price range. The published specs for most of these watches is 15 seconds. I set up this watch to work in metric. It can be set up to work in either the metric or the imperial system. The barometric pressure is an interesting feature. With some basic weather knowledge you an use this reading to have an idea if a storm is moving in, or if the weather will be clearing. The watch also etches out a pressure graph showing the last ten hours if I remember right. If you are changing altitude often this graph reading will be effected. A fun thing to do with a watch like this, to first set the altitude to the reference you are located at ground level. Now go in to a very high building and take the elevator to the top. Make sure the watch is in the altitude mode. You will see it counting up the altitude distance as the elevator is taking you up. You will effectively be able to see the height of where you are. You can also reference the barometric pressure before you go up, and then see the difference at the top of the building. The one thing that worries me with this watch, is if the user is rough on the watch the metal bezel may be easily marked. It is a very nicely finished metal bezel for the compass readings. The finish is a sort of mat finish which makes it easier to read under bright conditions. I have a Pro Trek type G-Shock watch with a rubber finish. This one has no bezel. The rubber they use would be very difficult to damage. For someone who likes a very good exploration watch I strongly recommend this one. The dealer service was terrific.

Fantastic watch. All of its functions work properly, it is easy to set up, the large face is easy to read, it is comfortable, and looks extremely cool. Despite its fairly hefty size, it is quite light, and doesn't catch on sleeves or bump into things. The button for the light is in a handy location, which wasn't case with another Casio Pathfinder I own. The only negative, and this is a bit nitpicky, is that the alarm could be a little louder. I love it.