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+====== Precision adjustment ======
+===== Definition =====
+**Precision adjustment** is the adjustment of a portable [[watch]] to reach an optimal [[rate]].
+Watches are regulated in different temperature ranges and locations to attain a rate as unaltered as possible. A change in the position of a watch can change the rate for a number of reasons (altered center of gravity, other pin friction, etc.). Therefore watches are finely regulated depending on the requirements of the [[precision]] of the rate.
+[[Chronometer]] watches are finely adjusted in five positions and with three temperatures. Observatories and public test offices check precisely, if the rate is kept within the required limits and issue a [[chronometer certification]] for each watch which meets the demands. Usually the number and type of adjustments is stamped or engraved in the [[movement]]. For example //"adjusted 5 (five) positions and temperature"//.
+See also
+  * [[Regulator]]
+===== Literature =====
+  *[[Das große Uhrenlexikon]]; Author [[Fritz von Osterhausen]]; ISBN 3898804305
+{{tag>Terms}}