Tachymeters are also an addition to the watch and stopwatch functions. Note that chronographs are produced at a higher rate which lowers the cost but not its performance. Regardless of the number, the added complications powering these timepieces naturally make it more valuable.
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A chronograph is a specific type of watch that is used as a stopwatch combined with a display watch. A basic chronograph has an independent sweep second hand and a minute sub-dial; it can be started, stopped, and returned to zero by successive pressure on the stem.