This is the most ambitious and risky—yet visually stunning—mod. The concept comes from professional dive watches like the Sinn UX, where the case is filled with a clear liquid (usually silicone oil) to maintain legibility under extreme pressure. The mod involves removing the watch module and battery, submerging the case in silicone oil, and reassembling it underwater, ensuring no air bubbles remain inside. When done correctly, the result is a watch with no "air gap" between the dial and crystal, leading to unreal legibility from almost any angle. In theory, it can also greatly increase the watch's water resistance by eliminating internal pressure differences. However, this is a high-risk, high-reward mod that can easily ruin the movement if the wrong oil is used or if not executed perfectly.
If you are planning to modify your watch, let me know how it goes. I can help you troubleshoot if you run into any issues during the process. Please tell me:
The most popular Casio W-800H modification requires opening the watch to alter the printed circuit board (PCB). Casio uses the same module chip across multiple watch models but limits features on budget variants by bridging specific solder pads. Removing a single solder joint unlocks a countdown timer and four additional alarms. Tools Required Precision Phillips screwdriver (size #00 or #0) Fine-tipped soldering iron or a sharp hobby knife Fine tweezers A clean, well-lit workspace Step-by-Step Instructions
Activates a fully functional, hidden countdown timer menu.
The Casio W-800H is more than just a retro-style watch – it's a blank canvas waiting for your creative input. Whether you're a seasoned MODder or just looking for a fun and affordable project, the W-800H offers endless possibilities for customization and self-expression. With its durable design, feature-rich functionality, and thriving MODding community, the Casio W-800H is an excellent choice for anyone looking to create a unique and personalized timepiece. casio w-800h mod
Clean off any leftover adhesive with isopropyl alcohol. Cut a small piece of aftermarket linear polarizing sheet and rotate it 90 degrees over the screen until the background turns pitch black and the numbers turn light grey. Cut it to size and apply it. 2. NATO Strap Conversion
1/10 | Cost: $10 - $30 The stock resin strap of the W-800H is stiff and dust-magnetic. Fortunately, the lug width is 18mm (though the gap is tight).
: While the stock watch typically has one alarm, shorting or opening specific jumpers can expand this to 5 programmable alarms .
On the standard W-800H module, pad ch3 or digit 4 (depending on your specific module iteration) is bridged with a tiny blob of solder. Use a hot soldering iron to carefully wick away this solder blob. Alternatively, you can use a sharp hobby knife to scrape and cut the connection, though soldering is safer for the board. This is the most ambitious and risky—yet visually
The internal components are highly static-sensitive. Touch a grounded metal object before handling the PCB to prevent frying the microchip.
is arguably one of the best value-for-money digital watches on the market. With a 10-year battery, 100-meter water resistance, and a classic square-ish design, it's a rugged daily driver. However, many enthusiasts know the W-800H for another reason: it is the perfect candidate for a (modification) that unlocks a hidden, highly desirable feature . This article will guide you through the most popular Casio W-800H mod
Disclaimer: This guide is for informational purposes only. Clockwork modifications and the use of soldering tools should be approached with caution and appropriate safety measures. YouTube·Sam's Watch Review
The crystal on the W-800H is made of acrylic, meaning it scratches easily. Buying a cheap film screen protector online keeps the display crystal clear during heavy use. 3. Inverted Display Mod (Advanced) When done correctly, the result is a watch
8/10 | Cost: $3 (Film) Casio sells negative display versions, but they are often hard to read. However, doing a DIY polarizer flip is a right of passage.
Peel off the factory-installed linear polarizing film from the top of the LCD screen using a razor blade. Clean off the leftover adhesive with isopropyl alcohol. Cut a small piece of aftermarket adhesive polarizing sheet, rotate it 90 degrees until the screen turns pitch black, trim it to size, and stick it onto the LCD.
Locating a specific solder jumper (often labeled on modding guides as the one to remove) and desoldering it using a soldering iron or carefully scraping it away.
A dual-function LED backlight mod that adds a red or amber "stealth" light (for preserving night vision) alongside the standard green/blue electro-luminescent (EL) panel.
However, it's crucial to approach modding with clear eyes. Every modification comes with inherent risks: