How do I snap a measurement between two vertices?

How do I snap a measurement to two vertices and then have that measurement scale as I resize the object it’s connected to?

One way to do it is with the “Scale Match Edge” feature, shown in the GIF and linked below, in Mesh Align Plus (my addon). The GIF shows multiple usages, but you want the first example: Choose two points on the source, two points on the destination, and apply to either the selected object, or to a mesh part in edit mode.

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