How to calculate the maximum length and width of an object

Hello,
I am trying to measure the size of a particular organelle in a cell. I have images of many cells with the organelle of interest labeled with a fluorescent marker. Is there a way to quantify the maximum length and width of this organelle using this program.

I’m new to this program so I apologise if this is a very trivial question.

Thank you in advance

Hi
@Sanduni_Hapuarachchi

Reading this chapter of the guide should help you.
https://imagej.nih.gov/ij/docs/guide/146-30.html#toc-Section-30

Otherwise, deposit an original photo and we can guide you.

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