the.com/chronograph

means A watch or instrument that can measure and record elapsed time, combining normal timekeeping with a built-in stopwatch function.

from From Greek 'chronos' (time) plus 'graphein' (to write) — the same root that gives us 'graph' and 'photograph.' The name was literal at first: early chronographs, built in the 1800s, used a pen or marker to physically trace the passage of time onto paper or a dial, 'writing' time rather than just displaying it. Mechanical stopwatch mechanisms later borrowed the name, keeping the 'writing time' idea even after the actual writing disappeared.