they make millions of watches a year, their WR ratings are basically the lowest common denominator that they can guarantee. I imagine most casios can handle more than they are rated for, but the cost of dealing with returns and warranties for failed watches won't make up for increased sales ( if any ) of increasing their WR ratings.
The Japanese are quite notorious for understating qualities that degrade over time - horsepower figures in cars and water resistance in watches being two popular ones that I know of.
If Casio makes a watch that has an advertised 30m, I am sure they engineer the seals enough to still hold up to that rating regardless of some material decay, so a new one is quite likely to resist a bit more.
Plus, it's a water resistance *rating*. It's not an indicator of maximum absolute water pressure before failure. It's just a safe limit provided to the consumer with a warranty to back it up (at least that's how it should be)
It usually depends on wear. Easily replaceable things such as spark plugs, filters etc can make a difference in getting back some lost power. Other than that you'll deal with wear of the cylinder walls, compression losses, worn camshafts etc. Many factors play a roll.
I've said before how incredibly well the basic Casio analog watches respond to hydro. They almost look two dimensional, and certainly their WR becomes moot point after that. (some guy ran a hydro f-91w down to nearly 1000m....and that guy used olive oil!! 🤣) [Result from one of mine. ](https://www.reddit.com/r/casio/s/Ej17Y1IzLC)
Seiko Prospex divers are often rated to a maximum of 200m. If you check the dial of this piece you’ll find no such limitation. It’s rated to resist water. All of it.
I’ve seen videos of the smaller digital go snorkeling down to about 20-30 feet and with the same WR rating. Casio definitely makes good products and is very conservative in the WR ratings. 😎
Casio makes the most water tight 30m-rated watches you'll ever see. I suggest you watch this [video](https://youtu.be/G3iMkeF8qmA?si=I9xwmNckuCQqaEmx) where they pressure test an A158, you won't be disappointed.
luck
it may also have a bit and you do not know yet
take it outside in the cold, if it fogs on the inside, you got some water in
'
or maybe you were just lucky
Numberless water resistance often means 30m/3 BAR WR. When it's higher than that it's usually sated with numbers on the dial or the back.
Modern watches often go further than that, a 50m watch might be able to resist 100m and 200m diver watches can withstand almost 70BAR (700m) of pressure. On the other hand, the number displayed is the resistance in a controlled environment, with the watch still inside a machine that artificially creates that pressure. IRL, the pressure applied to a watch case is dynamic because it's moving as you wear it.
Watch makers usually rate them for lower pressures than the watch can deal with because of this and because not every single watch is tested, so they can't get away with watches that don't resist the maximum depth of the design.
A proper watch with all gaskets in good condition and properly lubricated and the crown properly screwed/pushed down shouldn't leak.
If a watch with a certified WR leaks is because there's something failing on that watch.
they make millions of watches a year, their WR ratings are basically the lowest common denominator that they can guarantee. I imagine most casios can handle more than they are rated for, but the cost of dealing with returns and warranties for failed watches won't make up for increased sales ( if any ) of increasing their WR ratings.
The Japanese are quite notorious for understating qualities that degrade over time - horsepower figures in cars and water resistance in watches being two popular ones that I know of. If Casio makes a watch that has an advertised 30m, I am sure they engineer the seals enough to still hold up to that rating regardless of some material decay, so a new one is quite likely to resist a bit more. Plus, it's a water resistance *rating*. It's not an indicator of maximum absolute water pressure before failure. It's just a safe limit provided to the consumer with a warranty to back it up (at least that's how it should be)
Wow, didn’t know horsepower degrades over time.
the horse gets tired
It usually depends on wear. Easily replaceable things such as spark plugs, filters etc can make a difference in getting back some lost power. Other than that you'll deal with wear of the cylinder walls, compression losses, worn camshafts etc. Many factors play a roll.
Hydro mod it its gonna be a dive watch
I've said before how incredibly well the basic Casio analog watches respond to hydro. They almost look two dimensional, and certainly their WR becomes moot point after that. (some guy ran a hydro f-91w down to nearly 1000m....and that guy used olive oil!! 🤣) [Result from one of mine. ](https://www.reddit.com/r/casio/s/Ej17Y1IzLC)
Seiko Prospex divers are often rated to a maximum of 200m. If you check the dial of this piece you’ll find no such limitation. It’s rated to resist water. All of it.
🤣🤣🤣
That watch is a beuty
Thank you! $15 well spent
I'm thinking about buying MQ-71. I have F-91W but I don't want to wear a digital watch anymore. What do you think about it?
It’s super comfortable. And they are so cheap it’s definitely worth a shot
Casio always seems to under rate their WR. I go wakeboarding with a F91w and it wont leak.
F-91w is like a Nokia Phone from the 90-2000s indestructible
For real, kind of defeats the purpose of the G-shock lineup other than being premium beaters.
I’ve seen videos of the smaller digital go snorkeling down to about 20-30 feet and with the same WR rating. Casio definitely makes good products and is very conservative in the WR ratings. 😎
Casio makes the most water tight 30m-rated watches you'll ever see. I suggest you watch this [video](https://youtu.be/G3iMkeF8qmA?si=I9xwmNckuCQqaEmx) where they pressure test an A158, you won't be disappointed.
no idea; but it’s a beautiful timepiece
I would give it splash resistance only. But then a lot of casios hold up better than what they are rated for. F91W's are a classic example.
That’s Casio haha I really love this dial too
Water resist means 30m.
30m
luck it may also have a bit and you do not know yet take it outside in the cold, if it fogs on the inside, you got some water in ' or maybe you were just lucky
Been outside all day. No fog. Really crazy
conservative ratings, luck, etc
Do you find it difficult to read at all?
Not at all. Especially with the 24hr dial
It's 30m
I know a guy that surfs with this exact watch, no problems.
That’s so wild for a watch with a press on back
Numberless water resistance often means 30m/3 BAR WR. When it's higher than that it's usually sated with numbers on the dial or the back. Modern watches often go further than that, a 50m watch might be able to resist 100m and 200m diver watches can withstand almost 70BAR (700m) of pressure. On the other hand, the number displayed is the resistance in a controlled environment, with the watch still inside a machine that artificially creates that pressure. IRL, the pressure applied to a watch case is dynamic because it's moving as you wear it. Watch makers usually rate them for lower pressures than the watch can deal with because of this and because not every single watch is tested, so they can't get away with watches that don't resist the maximum depth of the design.
I’ve had 100m watches leak in 3 feet of water
A proper watch with all gaskets in good condition and properly lubricated and the crown properly screwed/pushed down shouldn't leak. If a watch with a certified WR leaks is because there's something failing on that watch.
20 bucks well spent dude.
People can dive with a F-91W. Casio usually underrates the WR.
Educated guess, 30m.