Question about ESQ 550 SLX 07100599 Wrist Watch
You need to buy some watch maker tools to get that back off as it is friction fitted and is difficult to remove as try to lever it off . If you do not intend to remove it or other watch backs for battery replacements, then the best solution is to take it to a Jeweler as he/she will have the proper tools to remove it and a battery replacement for about ten bucks. failing to do that look at the following site for the tools. http://www.harborfreight.com/catalogsearch/result?category=General+Merch&q=watch+repair+kit
Posted on Mar 20, 2011
Testimonial: "Thank you for saving me A LOT of time! I don't do this often with watches that I cannot get the back off myself so I will take it to a jeweler. "
Harbor Freight has a back removal tool that is inexpensive and works well. This watch does NOT have a pop off back. It must be unscrewed using a tool. Once inside, the battery is held down with two screws. You need to loosen one, then the retainer will slide away. I'd suggest doing it on a white cloth and using magnifier headgear. Makes it much easier.
Posted on Nov 19, 2013
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Posted on Jan 02, 2017
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Standard-quality resonators of this type are warranted to have a long-term accuracy of about 6 parts per million at 31 degrees C (87.8 F): that is, a typical quartz wristwatch will gain or lose 15 seconds per 30 days (within a normal temperature range of 5 deg C / 41 F to 35 deg C / 95 F) or less than a half second clock drift per day when worn near the body.
If a quartz wristwatch is "rated" by measuring its timekeeping characteristics against an atomic clock's time broadcast, to determine how much time the watch gains or loses per day, and adjustments are made to the circuitry to "regulate" the timekeeping, then the corrected time will easily be accurate within 10 seconds per year. This is more than adequate to perform celestial navigation.
Assuming that you have a computer with internet-synced time and good internet, meaning around 1/100 second accuracy, why not compare the watch to the computer over the space of a week?
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