計時器(calculagraph,timer)又稱停錶(stopwatch,stop clock)、秒錶,是測量時間通過的儀器或人員,在一般的情況下,後者通常利用時鐘碼錶來協助。此外,像是運動競賽的事件中,守時器記錄時間、經歷的時間、或剩餘的時間。

秒錶(模擬)
秒錶(實物)
電子秒錶

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