Anyone know anything about these under $200 dive watches with their claimed 1000 meters rating? They are large watches at 45mm diameter and 14m thick and include a claimed automatic helium release valve at the 9:00 position on the case. Back marking …
Continue readingEco-Drive Battery Life?
My oldest Eco-Drive is a Promaster Dive Ecozilla bought in December 2011. Back then the Amazon cost was $237 plus $4.98 shipping and no state tax charged. Still working great and with the original battery so now 13+ years battery life. What is your …
Continue readingAtomic Clock Advances
The new March 2025 Scientific American has a multi page article on advances in higher frequency Atomic clocks. They are talking of clocks that if in GPS satellites could give position readings accurate to 1 cm.
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