Replacement Carbon Disc for the Spark Timer by Go Science Crazy
$11.10
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These are replacement carbon disc for the Spark Timer (TKTMR). The Spark Timer is a recording device used to measure the velocity and acceleration of a falling or moving object. It sparks at uniform intervals, leaving marks on a paper tape. The distance between the marks on the tape are used to calculate velocity and acceleration. It is provided with a roll of tape, a carbon disc, and a clamp to hold it in position.
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$8.50
(-$3.82)
$11.03
(+$2.53)
$11.10
(+$0.07)