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Optical D Timer non Contact Ticker Tape Narika cellulose It can be used forNarika Optical d Timer Non Contact for Ticker Tape: The Narika Optical d Timer (C15 1708 Recording Timer d) is a distance measuring device designed for science experiments in school education a modern, non contact replacement for the traditional ticker tape timer. Instead of striking carbon dots onto paper, it shines light onto the recording tape inserted into its guide and uses an optical image sensor to continuously capture and analyse images of the