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Fitbit Ultra activity tracker in teal clipped to pocket. The Fitbit Ultra was announced on October 3, 2011. [18] The new features included: an altimeter that measures elevation gain in terms of floors, with one floor roughly equivalent to ten feet; a digital clock visible on the device's display; a stopwatch that can be used to time activities
The Fitbit Charge 3, a wristband health and fitness tracker introduced in October 2018, was the first device to feature an oxygen saturation (SPO2) sensor; however, as of January 2019, it was non-functional and Fitbit did not provide an implementation timeline. [44] The Fitbit Charge 3 comes with two different-sized bands: small and large.
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Examples of the reset button technique include dream sequences, alternate-history flashbacks, parallel universes, alternate realities, alternate timelines, daydreams, time travel, and hallucinations. In one trope that uses this technique (typically in science fiction or fantasy), a character will find themselves in a situation that seems ...
The next 3 decades saw the development of quartz clocks as precision time standards in laboratory settings; the bulky delicate counting electronics, built with vacuum tubes, limited their use elsewhere. In 1932 a quartz clock was able to measure tiny variations in the rotation rate of the Earth over periods as short as a few weeks. [39]
The resolution of an implementation's measurement of time does not imply the same precision of such measurements. For example, a system might return the current time as a value measured in microseconds, but actually be capable of discerning individual clock ticks with a frequency of only 100 Hz (10 ms).
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