Why does the %T on the spectrophotmete keep going up and down? It won't give an exact measurement.

EBK A SMALL SCALE APPROACH TO ORGANIC L
4th Edition
ISBN:9781305446021
Author:Lampman
Publisher:Lampman
Chapter88: Column Chromatography
Section: Chapter Questions
Problem 7P
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Why does the %T on the spectrophotmete keep going up and down? It won't give an exact measurement. 

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