Hi Mark,
I tried to flip the Measure Element under the CONST menu. This flipped the vector as you mentioned. What I need to be able to control is the actual movement of the probe to the element I am measuring to eliminate the cosine errors. I want to hit the element at a 90 degree angle to take the point. I'm now hitting at what appears to be a 30 degree angle sweeping or climbing up the apex.
...........................0./
..Probe............0.../ <-- angle to be measured
..direction.....0..../
.................0...... /
........................./

I hope this illustrates my question.

Thanks
Tom