[time-nuts] Most accurate clock on your wrist

Thomas A. Frank ka2cdk at cox.net
Mon Apr 16 23:46:20 EDT 2007


I would suggest that the most accurate self contained wrist watch you 
can get is the Synchronar 2100 Mk IV, after you've adjusted it.

It uses a fairly high frequency crystal (~700 kHz or so as I recall), 
and a digital divider you can set externally, in increments of 8 
seconds per year.

I got mine in the late 1980's, and have happily tweaked it yearly since 

 From New Years Eve 2000 to NYE 2001, mine held within 3 seconds.  Of 
course, to be fair, it WAS sitting on a shelf in a temperature 
controlled room the whole time.

It's pretty consistently within 16 seconds every year, leaving me with 
the quandary of whether to adjust or not...

Of course, now that they changed when DST happens (the date isn't 
changeable, you either compensate automatically for it or not), I have 
to manually reset the damn thing anyway...

Tom Frank

On Apr 16, 2007, at 7:11 PM, Palfreyman, Jim L wrote:

> Hi Folks,
> What is the most accurate wrist watch you can purchase? Obviously the
> radio controlled ones are the best, but I'm curious as to the fully 
> self
> controlled units.
> Oh and yes I have seen the photo of the caesium clock attached to
> someone's wrist!
> Also, on the NIST website they talk about a new development - the 
> atomic
> clock the size of a grain of rice. I see this as having huge future
> potential. Does anyone have any news on this development?
> Oh and yes I want one!
> Jim Palfreyman
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