Use A Camera To Check The Accuracy Of Your Wristwatch

Electronics project site Hackhut user Badwolf recently bought several cheap mechanical watches from eBay. Inexpensive mechanical watches are known to gain or lose some time each day, and he wanted an easy way to see how accurate his watches were.

His Pentax GPS camera had an intervalometer that can take photos every minute for long periods of time. To check the accuracy of the watches he merely set the camera up in front of all three and took a photo per minute for 24 hours.

This begs the question of how he knew the time on his digital camera was accurate. To verify this he went to the US Atomic clock site and took one-minute interval photographs of the site's clock until he was satisfied that his camera was indeed accurate.

The results of his experiment were that in one day watch #1 lost 24 seconds, watch #2 gained 2 minutes, 48 seconds, and watch #3 lost 24 seconds. He returned watch #2 as not being accurate enough.

Ebay Watches Accuracy [HackHut via Hack-a-Day]


    You have to be kidding.

    Step 1. Set watch to an atomic clock online.
    Step 2. Check watch ANYTIME against the atomic clock.

    Any changes?

    @rollz,you obviously misunderstand the stake here. The goal is to measure the drift,not overall error.

      I'm with rollz on this one; seems unnecessarily complicated ...

      @th3badwolf why not do as rollz said, after a week divide the difference by 7 and tada, there's your drift per day.

    "cheap mechanical watches"

    If you're buying cheap watches off eBay expecting accuracy then you are a fool.

    Any mechanical watch can gain or lose time each day, expensive or not. Even certified chronometers (generally very expensive) are only guaranteed for -4/+6 seconds per day.

    Should be re written:

    "The results of his experiment were that watch #1 lost 24 seconds, watch #2 gained 2 minutes, 48 seconds, watch #3 lost 24 seconds, and Badwolf himself lost 2.36 days on this stupid experiment."

    If you want accurate time but a $20 casio.That being said I bought a $10 chinese pocket watch of ebay that keeps better time than my 5 year old Omega speedmaster thats worth thousands.

    Pffft. I use the angle of the sun or the moon to tell the time. Have done since I was a kid and it NEVER gains or loses time.

    Forget analogue AND digital - go celestial!

    Time...? Is over rated.

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