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    Re: Gary LaPook's Digital Watch Experiment
    From: Örjan Sandström
    Date: 2012 Mar 8, 12:04 -0800

    Just an observation, Quarts crystals "age", most of that "ageing" is
    done during the first few years after that they tend to stabilize, this
    is well known in Amateur radio circles and I imagine is equally
    important in timepieces.

    2012-03-07 21:46, Zvi skrev:
    > Well, one thing that went straight back to Amazon the way it came was
    > that made in China Casio G-Shock DW5600E. Dark grey, muddy, low
    > contrast and difficult to read LCD screen plus a rate of about -20
    > seconds per month (worst case defined by Casio as + - 15 but Japanese
    > and Thai made examples doing much better than that) were enough for
    > me. Compare that to the tiny ancient 1980s made in Japan Casio F-84W
    > with its incredibly bright crisp clear screen and a rate of -8 seconds
    > per month.
    >
    > My little experiment continues with the little Casio and the Timex
    > Expedition joined also by a Polar F5 heart rate monitor, of all
    > things, that appears surprisingly accurate in time keeping, and by
    > another cheap and cheerful Casio F-108 WH. Rather than continually
    > calculating rates, I simply plot the errors of the watches against
    > days passed since setting them to GMT on a single graph paper. Will
    > report progress in a future post in a couple of months.
    >
    >
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