Measurement in inches way off ? Any Ideas Why

As you can see My object is not the size that it says. THings are fine with this addon if I just leave units alone. It tests out with other cad apps to be accurate. I just have to realize even though it says M it really means inches. But I wish I could get it to say inches. When I try to use inches as units in blender I come up with problems like this.
Any ideas why the measurement ad-don does not work with inches ?



Measurment Error.blend (464 KB)

Object scale is unapplied

Switching scene units to imperial and comparing edge lengths, they match with measurements measureIT gives

Another test with adding a cube after the scene units have been changed. Same result.

Blender is not a CAD application.