[time-nuts] Most accurate clock on your wrist

Tue Apr 17 09:25:02 UTC 2007

Hi,
Modern temperature compensated quartz movements are typically specified at +_ 10 seconds per year. An example is the Breitling Professional Aerospace I wear daily. Not excessively expensive (£1500) and not so obvious to muggers etc as a Rolex.
The best current spec is "The Citizen" with an A660 movement at +- 5s/year but that's if you wear it at least 12h a day.
See http://forums.timezone.com/index.php?goto=1910741&rid=0&t=tree for some more info.

Robert.

-----Original Message-----
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On Behalf Of Neon John
Sent: 17 April 2007 07:59
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Most accurate clock on your wrist

Hey y'all,

Interesting site but he's kinda behind the times, so to speak :-)
about what modern, more pedestrian watches can do.

Back around Christmas I bought a Luminox dive chronometer, model
3HMBM.  This is the one with the chrono functions in the form of a
little LCD screen under 12 o'clock.  I got this one for two reasons.
First and foremost, it has tritium-illuminated hands and dial. Second,
it's waterproof which means it's also mostly "me-proof"....

The analog and digital sections are separate and get set separately,
strangely enough.  Even more strangely, the analog part keeps better
time.

When I got the watch I spent a bit of time getting it exactly synced
with the NTP-controlled system clock on my computer.  I observed it
for deviation daily for awhile but it became evident that this
frequency wasn't necessary.  This is an amazingly accurate watch.  I
just checked it and it's almost 4 second fast.  That works out to
about a second a month.

This is by far the most accurate watch I own, including my WWVB synced
watches.  I have two, a G-shock and a combo analog/digital chrono
similar to the Luminox.  Both drift worse than a second a day if they
don't receive a signal.

I don't know if there is anything out there any better than the
Luminox but I kinda doubt it.  A second a month is superb performance
for a wristwatch.

John

On Tue, 17 Apr 2007 01:20:12 +0200, Sebastian Stolp
<sebastianstolp at gmx.net> wrote:

>hi jim, here's the thing you were asking for:
>
>http://home.xnet.com/~cmaddox/omega_megaquartz_2400.html
>
>as for myself - i do rely on a seiko 7548 reference quartz watch with  
>a 'drift' of +/- 15 sec. per month.
>noz bad for a unit used for boiling eggs on a sunday morning ;-)
>
>best regards, sebastian
>
>
>
>Am 17.04.2007 um 01:11 schrieb Palfreyman, Jim L:
>
>> 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
>>
>> _______________________________________________
>> time-nuts mailing list
>> time-nuts at febo.com
>> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
>
>_______________________________________________
>time-nuts mailing list
>time-nuts at febo.com
>https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
---
John De Armond
See my website for my current email address
http://www.neon-john.com
Cleveland, Occupied TN
All great things are simple and many can be expressed in single words:
Freedom, Justice, Honor, Duty, Mercy, Hope.  -Churchill

_______________________________________________
time-nuts mailing list
time-nuts at febo.com
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts

--------------------------------------------------------

Genetix Limited - Queensway, New Milton, Hampshire, BH25 5NN  Registered in England No. 2660050   www.genetix.com 
Any opinions expressed in this email are those of the individual and not necessarily Genetix Ltd (Genetix) or any company associated with it. This email and any files transmitted with it are confidential and solely for the use of the intended recipient. If you are not the intended recipient or the person responsible for delivering to the intended recipient, be advised that you have received this email in error and that any use is strictly prohibited. If you have received this email in error please notify Genetix by telephone on +44 (0)1425 624600.
The unauthorised use, disclosure, copying or alteration of this message is strictly forbidden. This mail and any attachments have been scanned for viruses prior to leaving Genetix network. Genetix will not be liable for direct, special, indirect or consequential damages as a result of any virus being passed on, or arising from alteration of the contents of this message by a third party.
--------------------------------------------------------