cytophotometer

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun An instrument used to identify and locate the chemical compounds within a cell by measuring the intensity of light passing through stained sections of the cytoplasm.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun biology An optical device which measures the light passing through a stained section of tissue in order to analyze the compounds within its cells

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun a photometer that can be used to locate and identify chemical compounds in a cell by measuring the intensity of the light that passes through stained sections of the cytoplasm