I just need the program to create the two arrow heads with the attached line in between with no numbers showing in the middle.

The basics of the measuring tool should be that it can't know the ratio and the actual length of an object and you have to manually put in the numbers and length you want. You have to say how long the object are in simple text so to speak.

|<--- 13 mm ---->| (what i don't need).

|<----------------->| (what i want).

This helps me in my line of word and speeds up my reports.
Today i manually put in the arrows and line trough "drawing tool", this takes time when you have 1-10 defects to show what measuring for.
I take pictures of defects, send them over to my pc and creates a PDF form from that an add text, measuring and arrows and it will speed up my work if you just put in the option to NOT use the numbers the program gets when measuring but instead use the ones i have on paper.