All the assometer is is a stiff pc of foam that indents under your sit bones, and leaves the indents long enough to measure between. A memory foam pillow may do the same thing, or it may be a bit too squishy.

I used to set my seat so the back to front was level, with the middle lower. Found it to be a tad nose up that way, so I made a slight correction to drop the nose. Feels better, but haven't hit any long length rides to know if its lasting improvement.