The term 'chronograph' means 'time recorder' and usually refers to watches with a stopwatch function. Like a stopwatch, you can use a chronograph to measure periods of time. It also displays the time and often the date as well.
Do you need chronograph?
While one can be fun to play with, however, most people don't need a chronograph today for its functionality. Let's face it: chronographs are popular in no small part because they look cool — and serious, and masculine.
Is it bad to run the chronograph all the time?
Leaving the chronograph running all the time will eventually run the oils dry and have wear and tear on certain friction parts that are subject to stress. ... In fact, starting and stopping a chronograph continuously might wear out the gears faster than usual.