Recording timer spare - small, paper roll
Recording Timer Paper Roll, small (as supplied as part of the Recording Timer Kit), 30m long x 16mm wide. White paper roll for marking with dots. A piece, long enough for the experiment, is normally torn off the roll and threaded through the paper guides on the platform with a carbon paper disc on top.
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Recording timer spare - carbon discs, pk/25
Recording timer spare - carbon discs, pk/100.
Recording timer & kit, 5-12V AC -50 dots/sec.