Never used a Ass-o-meter or any other thing to measure my sit bones. One thing everyone needs to know about the structures we call sit bones is that they are like the runners on a rocking chair. Curved and they get closer together as they go toward the front.
So while sitting upright, your sit bones will be further apart. While leaning forward and aero your sit bones will be closer together. So with one measurement on a ass-o-meter, you still have a bunch of saddle profiles to try to find the right one.