TICKER TIMERS [Plain]: Self marking, with spare carbon discs

TICKER TIMERS [Plain]: Self marking, with spare carbon discs.

•  A variety Ticker Timers for use in the science laboratory with spare parts including :
Carbon discs  |  Repair kit  |  Plain  |  Self marking tape Ø 16mm.

(Wikipedia excerpt: ..."A timer or countdown timer is a type of clock that starts from a specified time duration and stops upon reaching 00:00. An example of a simple timer is an hourglass. Commonly, a timer triggers an alarm when it ends. A timer can be implemented through hardware or software. Stopwatches operate in the opposite direction, upwards from 00:00, measuring elapsed time since a given time instant. Time switches are timers that control an electric switch. ..")

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