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Pedometer. A pedometer, or step-counter, is a device, usually portable and electronic or electromechanical, that counts each step a person takes by detecting the motion of the person's hands or hips. Because the distance of each person's step varies, an informal calibration, performed by the user, is required if presentation of the distance ...
Activity tracker. An activity tracker is an electronic device, or an app on a device, that measures and collects data about an individual's movements and physical responses, towards the goal of monitoring and improving their health, fitness or psychological wellness over time. [1]
The most accurate experimental pendulum clock ever made [22] [23] may be the Littlemore Clock built by Edward T. Hall in the 1990s [24] (donated in 2003 to the National Watch and Clock Museum, Columbia, Pennsylvania, USA).
Quartz clocks and quartz watches are timepieces that use an electronic oscillator regulated by a quartz crystal to keep time. This crystal oscillator creates a signal with very precise frequency, so that quartz clocks and watches are at least an order of magnitude more accurate than mechanical clocks. Generally, some form of digital logic ...
However, there are autonomous quartz movements, even in wrist watches, that are accurate to within 5 or 20 seconds per year. [46] At least one quartz chronometer made for advanced navigation utilizes multiple quartz crystals which are corrected by a computer using an average value, in addition to GPS time signal corrections.
The most accurate clocks use atomic vibrations to keep track of time. Clock transition states in atoms are insensitive to temperature and other environmental factors and the oscillation frequency is much higher than any of the other clocks (in microwave frequency regime and higher).
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