Can one use the rectangular marquee tool in photoshop and specify a size based on the custom "measurement scale" specified in the "Analysis" tool. I want to use it exactly like using the ruler tool when the "use measurement scale" box is checked. Thank you
You can fix the size of the
Marquee tool to whatever dimensions, in whatever units you want to use.
You can also use the marquee tool to measure units in Photoshop's default unit of measurement.