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The Loupe (pronounced loop). This is a magnifying piece, normally ten-power, worn by the jeweler over one eye, enabling him to see the minute details necessary for careful and thorough examination.

No, but all quality watches have a degree of resistance. Water Resistance is a common mark stamped on the back of watches to indicate how well a watch is sealed against ingress of water. It is usually accompanied by an indication of the static test pressure that the watch was exposed to in a leakage test. For example 5 ATM (Atmospheres). The test p

Complication means a movement design part that deals with a feature beyond the display of hours, minutes, seconds.

Yes watch is a very good example of a commodity which fits in all three categories. 

A mechanical watch is so named because it contains inside the outer case, a mechanical movement. Such movements were used in clocks for centuries before being adapted for watches.

A diver labeled watch has been pressure tested to the stated maximum depth rating for a prolonged period (and other extensive tests to qualify as a diver). A watch not designated as a diver but with a dive depth rating (like 50M to 200M) is not guaranteed to survive at that pressure for longer than a brief moment, however it may well survive withou