FAQ: Solid State Watch
For the most up-to-date information about the status of our project, check our project updates on Kickstarter!

How accurately will you be setting the time, and from what source clock?

We’ll be setting the time to ±1 second based on https://time.is/ (which is synchronized to an atomic clock)

Last updated: February 18, 2020 19:45

What will you do with the discarded Casio enclosures?

We’re saving them up to run a kids workshop to have kids fill them with little knick knacks (googly eyes, glitter, paper notes) so they can make a little art piece to wear around.

Last updated: February 18, 2020 19:45

How accurately does the F-91W keep time?

TLDR; If worn on your wrist, it will likely deviate less than 15 seconds a month.

The F-91W, like many other quartz watches, uses a tiny tuning fork shaped crystal that is tuned to vibrate at a specific frequency. 32,768 Hz. This oscillation is then divided a bunch of times to get to a 1Hz pulse. So the watch’s accuracy is tied to the oscillation of the crystal.

Many things can affect the crystal’s frequency, but the most significant is temperature. The crystal is tuned to resonate at body temperature, so keeping the watch in hotter or colder environments will increase or decrease the crystal’s frequency.

All that to say. The F-91W is a little nugget of magic when it comes to accuracy. It’s very very accurate. In its worst case scenario, the watch could deviate up to 30 seconds a month. If your Casio is drifting that much, you got unlucky (or super lucky depending on how you see it). In practice, you’re probably wearing the watch, so that already helps a lot. And chances are you got a watch that’s somewhere in the middle of the deviation curve (not an outlier). So it’s likely your watch will run less than 15 seconds fast or slow each month.

If you want to see some accuracy data from a hundred F-91W Casios that have been running for 13 years, you should watch this video… https://youtu.be/hwOMUhS8gV0?t=46

Last updated: February 19, 2020 20:02

Shipping Updates
For the most up-to-date information about the status of our project, check our project updates on Kickstarter!
No shipping updates are provided.
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