How to Make a 200m Dive Watch for $25

[@CCPwillfall01]

I love this video no 20 minute vlog bs just 100% quality content

[@FabsPro123]

And informative.

[@youssouf.a]

Yes, i thought the same.

[@delemont83]

Wanted to comment the same

[@mikeli3720]

Somehow, casio really understated their products, it's a lot more robust than they claimed

[@betulaobscura]

It is better to underrate than overrate.

[@HGSolberg]

@@betulaobscura Not according to Chinese watch manufacturers. LOL

[@azharulhisham1960]

Typical Japanese company philosophy. Never over promise, but always over deliver.

[@boxbox0000]

humble at its finest

[@swagathshetty]

pretty sure its to avoid lawsuits

[@ucheucheuche]

0:28 "Watches that do more than keep time. They keep you ahead of your time" Popular in the 80s, 90s, 00s, 10s, 20s, 30s. TRUTH.

[@julioc.7760]

funny thing is, most guys who wear diving watches have never dive :(

[@yannisgk]

true!!!

[@michaelpeacock9420]

Very true I wear a g shock and it's never been in deep water 😅

[@julioc.7760]

@@michaelpeacock9420 mine doesnt even go in the shower.

[@yannisgk]

@@michaelpeacock9420 i wear the king of g-shocks and i don't even wash my hands!!!lol.

[@Maxumized]

Depends on what kinda diving😂

[@Drownedinblood]

Casio proving once again they basically made the perfect functional watch.

[@kahlzun]

Casio and Nokia are the products that will outlive us all

[@pauloleffa]

I’m a fisherman in a coastal fishing ship near the southern Brazilian coast and do a lot of job in the deck that involves water, fish guts, various kind of fluids leaking from fishing equipment, diesel oil, lubricants, sweat, tears, rain fall, Anyway, many hard blows in day-to-day tasks. Sometimes I even forget that I'm wearing a watch and, worst of all, sometimes it gets so dirty that I can't even see the time. But a quick wash in the debris bucket is enough and there it is ready to show me the time. I've ever had to dive to release stuck nets and I've never had any problems. In other words, I wouldn't exchange my F-91W for anything

[@WyvernDotRed]

The "depth" rating is actually of equivalent pressure and does not include any increase of local pressure due to currents. So you tested it to a higher standard than what a watch pressure tester would, it's more like the "300M" rating. But hydro-modded watches are known to be practically infinitely waterproof, though with a bubble the caseback might dent in. What went wrong with the stock F91-W is that the inner air compressed so much, that the crystal pressed on the LCD and shattered it's glass. I've hydro-modded a B640M and a GBX-100 myself, with the latter the oil broke the screen, which I repaired with a new polariser. Another benefit is better viewing angles, especially under water, where the crystal doesn't turn in to a mirror beyond a certain angle. It is tricky to avoid a bubble from forming in the plastic housing of the module, which might get out over time. And depending on the used oil it might turn yellow or cause the gaskets to swell, the latter also happened to my GBX-100. Even still, stock F91-W are known to survive being used on actual dives, as Casio greatly understates their water ratings. Also, you commented on dive-watches being too expensive, but only mentioned Omega in the end. Perhaps the cheaper Vostok Amphibia divers, or Chinese imported ones would be interesting too. Just One More Watch recently showed a 1000M rated diver, though it's gaskets were smaller than a Vostok's and the F91-W's.

[@MichaelAChang]

"But hydro-modded watches are known to be practically infinitely waterproof" That's not quite true - there are many little devils in the details when you get into the technical nitty-gritties. Even SINN watches, the best known hydro-watches, are only rated at 5,000M for the (Ronda quartz) movement and 12,000M for the case. For movements such as the F91-W, the display will eventually crack under pressure whereas quartz movements without digital displays might survive deeper, but its hermetically sealed crystal and its thin circuit board might become the weakest links thereby limiting its dive depth. Also keep in mind that ocean depths below 200M is at about 4°C where oil viscosity becomes an important consideration for ticking hands. Filling an F91W with baby oil might be good enough for rock-n'-roll suiting the needs of most people, but getting down the deepest ocean depths is a whole different technical and scientific challenge that becomes much more involved than a 5 minute KZbin video.

[@WyvernDotRed]

@@MichaelAChang which is exactly what I meant with *practically*. As a general user who would wear a watch, even professionally diving, you would not exceed what the hydro-modded watch can take. Of course, in situations you can not enter yourself, this can be exceeded and cause the watch to break, in the ways you described. And it speaks for itself that in such a professional setting you should not depend on an uncertified modding project, at most using it as an additional backup to see how long it holds up.

[@Andrew__Smith]

Don’t talk about the Russian “VOSTOK”, this is completely shit, not a watch, and the staff of their factory supports the terror perpetrated by Putler in Ukraine.

[@HGSolberg]

@@MichaelAChang No one dives to 5,000 meters, unless inside a mini u-boat. Also, the SINN watches will take a lot more than what they are rated for.

[@julianhowarth1075]

Firstly, there's no such thing as a waterproof watch, only water resistant watches to varying depths, depending on their quality. An interesting experiment though and I'm not saying filling with oil wouldn't work. Two points though. As far as I'm aware, ordinary oil CAN be compressed and this is why we use hydraulic oil in machinery and brake fluid in vehicle braking systems. Brake fluid is chosen over ordinary engine oil 0:04 specifically because it cannot be compressed. Secondly, when a watch button is pressed for whatever reason, it's inevitable that oil will leak and air will enter the watch, affecting its water resistance. Thirdly, how does the oil react with the electronics within the watch ?.

[@jayp4303]

I've been snorkeling with my stock F91W multiple times in salt water, and never had a problem with water intrusion or corrosion. Those are shallow depths, but I would say that it's more than just "water resistant". (Also I regularly do things like hose off my arms, take showers with it, dip into buckets of water, etc.) This video is a great idea for deeper depths, and it makes total sense. As long as the mineral oil doesn't eat into the plastic casing or gasket over time.

[@HGSolberg]

"As long as the mineral oil doesn't eat into the plastic casing or gasket over time." Or into the electronics. Silicone based oil is a safer choice than mineral oil. It's a bit more expensive, but you don't need much of it.

[@thombaz]

How the strap holds up? Mine started to crack after about 2 years.

[@purpleneons]

@@thombaz It's about their lifespan it seems, because I just ordered a replacement NATO strap after mine also started to crack after exactly 2 years.

[@EddieHub21]

That's actually genius

[@cameronj8827]

Very nice. Bell & Ross used this same science to create the hydro max, which is water resistant to 11,000 meters, but costs around $2500

[@HGSolberg]

The oil filled watch will take a lot more pressure than 20 bar. Another benefit with this method is that you should be able to operate the buttons under water, without water finding it's way into the watch, something you are not supposed to do, even with the most expensive dive watches. I do believe it's a good idea to use silicone based oli instead of mineral oil, though, since mineral oils might have small amounts of corrosive components in them, that might harm the watch over time. I also believe mineral oil will yellow over time faster than silicon oil, but not 100% sure about that.

[@adsagp]

Thanks for your comment. That answers my question about if the buttons can be pressed while submerged. Good to know about silicone oil, not sure how readily available that is where I live.

[@jayheslin803]

​@adsagp Silicone oil is a common item. Just google it, and you can find out where to pick some up or order online. It is more expensive than mineral oil, however. Getting a sufficient amount to perform the process in the video will probably negate the benefit. I suppose you could simply remove the caseback and just fill the watch directly from the bottle. That may work.

[@sargera1]

Also better angle of view on the screen

[@ge48421]

This mod will get you a very small dive watch, the downside is a messy battery change. Once you add silicone oil price you could just get a Casio with a 200m rating like a DW291, so mineral oil makes sense given the price of the watch. If 100m/10bar is enough you have a choice of plenty of watches (w800h, AE1500, AE1200) in the low $20 (US) range, which will withstand recreational scuba diving without needing a mod. Of course, if you really go scuba diving and need to time decompression stops use certified equipment, not a $15 watch filled with baby oil.

[@Substraal]

Wrong! Use only M3 Fluorent FC40 oil. Don't yellow and don't eat your components inside the watch

[@RafaelCarvalho-rd5lc]

My f91w is my go-to watch for surfing for years now and it has never let me down, even when taking 2m waves right in the face it acts like it ain't nothing

[@omgwtflmaololrotfl2368]

any watch that has a waterproof rating will do what you just said. even a el-cheapo will do it no problem. surfing and diving are 2 very different environments. 1 is extreme depth with lots of pressure the other just splashed on the surface... Taking a wave to the face what has that got to do with the watch....stupid comment

[@SamMaskery]

Great to hear thanks for the helpful comment! I’m thinking of giving my groomsmen a f91 w as wedding gifts and a few of us surf so this is great to know!

[@jayheslin803]

​@omgwtflmaololrotfl2368 Recreational divers bottom out at 40 meters. Not particularly extreme conditions nor excessive depth. I don't have personal experience with this watch, but numerous cheap $20-$30 Casio watches with slightly more WR have survived significant time at depths beyond 40 meters during technical dives. Depths at which 90% of divers will never see. They survive. They work fine. I would hazard a guess that the stated WR on a given Casio watch is at least ballpark accurate.

[@JakeSea]

Hi Everyone! Brett and I are very appreciative of all the support on this video. It has been amazing watching it explode in popularity. And while many of you appear to be watch enthusiasts (myself included), those of you here for the boating can still find us on my channel. Brett and I still make content together and would love to see you over there! We just might drop a few more watches to the bottom 😉

[@meg5677]

Ive been using this watch for 3 weeks working 5 -6days washing cars and never had a problem best value for quality!

[@watchingdanny]

Excellent demo. And with the humble F91W too. Great job.

[@chrisp.5272]

Love my green F91W, it’s my landscaping watch, and I nicknamed it the Master Chief watch.

[@phantom_god_999]

If you press the buttons of the modded one, will the mineral oil seep out?

[@anhtuannguyen16799]

Nope it won't, there is a rubber gasket around the button

[@pablolara797]

​@anhtuannguyen16799 but oil can not be compressed. Therefore, the button can not be pressed, or if it can be pressed oil should flow outside. Well, the rubber can be compressed. Maybe enough to permit the button to work. I do not know for sure.

[@REVIEW_JUJUR]

It wont leak… i did hydromod to all my kids casio. It is really fun, and work fine so far.

[@MuhamadDjazuli.]

​@@REVIEW_JUJURbisa bang??

[@nicknameless5581]

​@@REVIEW_JUJUR but does the alarm work ?

[@incargeek]

I think this shows that the buttons are well sealed. If the non-oil watch buttons didnt seal, water would have seeped in to equalize the pressure, and the glass might not have broken. Of course, the electronics might have failed eventually in the salt water but its worth testing a pressure- equalized watch.

[@stoundingresults]

Poor Casio on the left sacrificed for science. 😔

[@NailBozkurt-g1v]

Soldaki sahtemi gercekmi

[@peperiera555]

The magical part is that for 10 bucks I’ve been pushing it to the limit with no fear and it’s always responded perfectly. If anything went wrong (for two years it hasn’t) you can learn the lesson and get another one

[@johnstarks5323]

My issue is what are the long term effects of mineral oil on the internal components, and insulated coating on the pcb.

[@MindBlowerWTF]

It's not conductive, people used to build fully submerged PCs

[@Tom9mm]

Hey thank you for your video this is awesome I've been working around boats for a little while now and everybody tells me to get a watch that's at least 200 m water resistance but I don't really have the money for it and now I have solution to my problem thank you

[@vansh25]

casio duro, casio dw291hx are great 200m affordable options for you.

[@ManuelRodriguez-ed1wu]

Can you still hear the alarm after the mod. Or does the oil muffle the ringer?

[@lyhaikudai3]

So if a G shock get mineral oil it can go 1000m

[@gerry9306]

Let us know 😊

[@kahlzun]

Just saw a video where a hydromodded gshock exceeded 4000m of pressure with 0 problems

[@gabor222]

You could start with a Casio w59 which is about the same price but has better water resistance by default and mod that.

[@simonnomis5302]

man my fw91 can handle 30 meters...without oil and stuff

[@patricj951]

Interesting video! Just a note: the unmodified watch IMPLODED, not exploded.

[@pozidrive]

Noob question. Wont the mineral oil corrode the rubber seal?

[@Anonnonon]

Now the remaining piece of the puzzle that will probably destroy all dive computers is adding a depth gauge to this bad boy ..

[@alexanderstephenevi733]

My f91w is worn daily in the sea, pool, shower, ecc. after 3 years still perfect…

[@TaguroSuper]

The only downside is that you need to repeat the process once you need to replace the battery.😅

[@martin.tanubrata]

once every 7 years... I dont' mind

[@jinglemyberries866]

​@@martin.tanubrata same!

[@somewhatideal]

In theory this should be possible with copies of casio right? I stumbled upon a brand called Skmei and wanna try this out for our next freediving sesh. It doesn't go as deep as the video for sure but it looks fun trying out.

[@smarteveryday1606]

omg, my family only wears casio. no money can give the satisfaction and trust like casio does at a fraction.

[@takitam2521]

Are buttons still functional ar they will leak oil when pressed?

[@daras-]

Mineral oil eat plastics, you have to use silicon oil.

[@adamzain6770]

A bit messy and unnecessary when you can usually get the Casio AE-2100W for half its listed price, at about 30 quid (i.e. probably $30 in the more favourable US market). That’s 200m water resistant and has a nice stainless steel front piece, mineral glass, a ten year battery and all the bells and whistles of the Royal, but with nicer looks.

[@cobaltace62]

it is called an ‘aqua-mod’. can only be done on a quartz watch with no analog arms. I did this on a Casio quartz analog dive watch and the motor had to work harder moving thru the oil and wore out the battery in about 3 weeks.

[@MindfulSmile0]

Everyone knows the f91 will survive nuclear fallout

[@ajaypatro1554]

How long the stock did survive though??

[@derhochwohlgeborene8548]

This should work with any casio, right?

[@Numberzerosix]

Any digital watch. Probably not for watches with movement.

[@fridrekr7510]

⁠@@Numberzerosix Analog quartz can be done but it decreases battery life.

[@RedRikson]

Question #1. If mineral oil is not a conductor, what happens to the contacts from the battery to the contacts to the watch? Question #2. Oil is more viscous than air. In the case of classic watches. Will the viscosity of the oil affect the rotation of the needles and gears? What about the battery life?

[@X85283]

1. There is still a metal-metal connection 2. This will 10000% destroy a mechanical watch. It will have a serious affect on the battery life of a quartz analog watch (ie with hands).

[@Simon89Jeppesen]

It can be used anyway for diving. It is mind blowing....

[@MishMash22]

Now this is real science!

[@banesrbija1980]

It was just a casual hydro mod video all until the boat scene, then I knew that things are getting serious!

[@akiblue]

I had a tear in my eye when I saw the Simpsons and Zellers logos

[@Numberzerosix]

Thanks mate that’s a great idea! I'd buy one but I need a mineral glass face, not resin glass because of my job the resin will scratch and get chipped in no time, but if I find a watch that has a mineral glass face and no real warer resistance Ill definitely have to try this!

[@ThisIsDavesGarage]

Instant sub. This is the type of watch content I've been waiting for.

[@papajohncena2516]

Had two f-91ws that I would swim laps in a pool in. They never so much as even leaked. I would dive to the bottom, around 10 feet, and I wouldn’t even get any condensation on the display. Later replaced it with a databank and accidentally went swimming in it. Display fogged up bad but still worked.

[@cengi7]

Mineral Oil USP (United States Pharmacopeia), or pharmaceutical-grade mineral oil, does have a shelf life. When stored properly (in a cool, dry place away from direct sunlight), its shelf life is generally considered to be 3 to 5 years. However, this period can vary depending on the oil's purity, packaging, and storage conditions. Signs of Deterioration: Discoloration (darkening or cloudiness) Change in odor Variations in consistency These signs indicate that the mineral oil's shelf life has expired or that it has started to degrade.

[@cengi7]

In that case, you'll have a 3-year F-91W diver's watch. Still sounds nice, doesn't it? :)

[@richardmclean5913]

How long will the mov't last after being doused in mineral oil? It may be WR to 200M but a movement full of oil is likely to stop working soon.

[@eddiejones.redvees]

It would be great to do the same with a g shock to see how far past it’s 200M limit

[@TheBird..]

Lowkey clever as hell

[@vek7561]

Loved the video! was looking forward for such a explained mod and the test video itself! superb production quality looking forward to more such videos!!!

[@SanicTheHidgehag]

You know what a traditional dive watch can do that a Casio F91-W can't? Make it through airport security.

[@allanbernabe38]

This is a good idea. Only inconvenience is whenever your replace batteries, it will be kinda messy.

[@SK_ES519]

What kind of sorcery did I just watch?! Goddamn, I am ashamed to call myself a Physics master's student.

[@crezzwell]

This watch was issued to all participants on the TV show SAS are you tough enough? They were jumping out of helicopters into the middle of lakes in Scotland etc and all the rest of the punishment that they do. So I think the F-91W is a bit tougher than you'd think.

[@fredericcolombier5380]

Casio are very reliable watches , my father like the Casio , he have plenty of them from the ealy 80's to today , for every day , they all works. Part of them , on their original Battery .

[@dieselgoinham]

🧢🧢🧢

[@100mcreations6]

​@@dieselgoinhammy casio works for 14 years on the factory battery.. all functions working

[@villewintermaul1907]

Interesting the standard one completely exploded at exactly 200m❤

[@bean_____Boi]

That was a cool video. Now I want one again

[@JM-rw9je]

Anyone mentioning that badass gopro holding on those 200M???

[@remifassol4198]

Just how cool is that! Thanks for sharing!

[@Olympus_318]

That was awesome, but,won't the oil leak out every time you press the bottoms?

[@tree-service]

when any button was pressed oil will leak out and the space will fill with air or the button will not press back. its one time modernization, not for conctant use, i think

[@balazsszomor5964]

Actually you can surf or even snorkel in it out of the box. But good idea with the mod. :)

[@RCYT_]

Won't the internal components get spoiled with the oil??

[@RobertQuinn-w3n]

No the oil doesn't react with the metals or plastic

[@RCYT_]

@@RobertQuinn-w3n Not react, but it gets wet

[@leonidasmark]

That's insane. I'm guessing you can only do that with digital watches though? Because mineral water would interfere with the movement of any analog quartz or mechanical movements

[@davidd1016]

Awesome...well explained ...pressing the buttons on the oil filled watch still possible I'm assuming...not enough of the button entering the case that cannot be displaced forcing oil out?

[@CaptainRon956]

My question is if the watch is not even rated to wash a car or do dishes then how do the pusher seals keep the oil from leaking all over your wrist?

[@dantepaule4311]

Very impressive demonstrations...can try also with other siblings W59, F84W, and F105W

[@aliabdurrahman]

It would be great to have a follow up on how long the mod watch lasted with the oil in it

[@WitnessForChrist0]

Please forgive my ignorance....But.... How does the oil not break the module?

[@shekelsean]

I assume this can be done with most casio watches, too? (Ae1200, specifically)

[@watch-highres]

Liquid moding really helps to many watches and also helps better magnification with diver watches with regular flat glass it creates dome style magnification effects too. Great video with lot of efforts to show test section.Thank you.I watched it even though I knew what the results will be. 😎👍 keep the good work us much as possbile

[@johnberry2877]

Just buy a Timex Ironman problem solved. I have dove with a Timex for years in water from Michigan to Grand Cayman. Never flooded ! And way easier to set and use than the Casio.

[@Sockfrown]

Casio are the watch goats

[@KidsInCombat]

I need to try this!!!! Thanks for sharing this

[@watchthis90]

What if you pushing the buttons? Where the oil goes?

[@alvarogvdltgarcia52]

Amazing video. The first time i see a oil moded f91

[@ys-50989]

What about batteries?

[@SaSpursFan]

stupid question but how does oil not damage the electrical components of the watch like water does

[@xoibor]

They only use oil that isn’t conductive so it doesn’t short any connections

[@sandsgrainofsand5320]

water is a circuits worst friend, on the other hand you can run a whole computer in mineral oil if you wanted to(fans and all)

[@igrewuponsupernintendo]

With this mineral oil modification, can this Casio be used again, as in change the battery years later, and it will still work?

[@anakmuda5439]

damm this channel is underrated

[@andreytotsamiy8482]

А звуковой сигнал в часах работает после залитые масла во внутрь?

[@FullTimePRO]

Just don' press that button to activate the light down there or you might have a problem ;) Also I've heard that the oil can expand and kinda weep if it gets hot out but YMMV.

[@kirxuir]

Yes, that's why it's better to use high-quality silicone oil.

[@zugzug6773]

I wonder if there are any long term effects on the watch internals from being full of oil.

[@owenlaprath4135]

Mineral oil can damage your seals! Use silicon lube oil instead. There is O-ring lube-oil that should work very well.

[@jameshuang8870]

Nice, but not a big fan of this mod. So when the battery goes flat, you dispose it?

[@femrebostan]

Can you compare Seiko and Rolex diver watches in the same way?

[@OverlandOrange]

Will this work with the "metal" version? (I suspect it will, since it's not really metal and its construction is nearly identical).

[@TheAtheosForem]

will the oil eventually damage the watch?

[@ae70gts]

from time to time i wore a DB-56W telememo(50m water resistance lol) while in the military . special forces paratrooper.year 1996 1 day i forgot to put on my G-shock and was stuck with the DB . that day we had a HALO jump which was followed by a sea landing/diving and then swim 300m to the shore . when i was in the plane i thought ''that is the end of the watch'' the watch is still in my possession and working 100% crazy 🤪 🤪

[@Flockingtheherd]

Mineral oil does go bad after a few years. Use flourinert if you want to make it last forever. Although kinda pricey

[@HGSolberg]

I'm thinking silicone-based oil is better than mineral oil, and a good compromise for most cheap watches. (People probably won't do this on expensive watches anyway.)

[@m4rch10r1]

How the quartz crystal is able to vibrate drenched in oil is something that I don't get. Shouldn't the watch timekeeping be affected by that?

[@Unlucky1776]

Yea it will make the watch a bit less accurate I believe

[@Andrew__Smith]

A vibrating quartz crystal is placed in a hermetically sealed flask.

[@pixo4552]

Really great vid, thanks!

[@dman7517]

So that's what p Diddy was doing

[@alexsystems2001]

Ok that was a neat experiment

[@gerry9306]

Yes it was really swell too

[@mbanzf]

can you same test with casio mdv 107 aka duro

[@nunonunes097]

Pardon my dumb question, but how do you change the battery in a modded F-91W? Will the viscosity even allow it? And do you have to repeat the oil process?

[@jinglemyberries866]

just disassemble the watch over some paper towels or something and let the old oil run off the components and grab your new battery, submerge it and the other components in new oil and assemble the watch again.

[@kotimoto]

Will this work when Muff diving too?