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:*A that can [[measure]] how bright the [[light]] is.
:*[[Light Gate]]s which can [[measure]] the [[speed]] of an [[object]] and the [[time]] taken between the [[Light Gate|light gates]].
===References===
====Edexcel====
:[https://www.amazon.co.uk/gp/product/1782946748/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782946748&linkCode=as2&tag=nrjc-21&linkId=a4f0348fc37d0ba1bb52d27f8679581f ''Data loggers, page 110, GCSE Biology; The Revision Guide, CGP, Edexcel '']