I have a part that has a radius on both ends. How do I set this up to measure the overall length between the two radii

[[ji...]]

[[Cl...]]

Looks like you figured it out.

[[Ch...]]

his picture shows the far end going to about only the center though. sometimes you have to close and reopen to get the arrows to correlate.

I believe it should be Max/Max in this case, but if it's not giving you correct nominal try minimum for one. Make sure arrow correlate after closing characterstic.

[[DW...]]

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 Change the front to minimum. Leave the back to maximum. The min and max values are from the features in their respective axis. So you would want the minimum Y coordinate of the front feature, and the maximum Y coordinate of the back feature.

[[DW...]]

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 I believe it appears that way based on the viewing angle. The back is at maximum like it should be... but I do agree the Caliper Distance can get wonky visually sometimes, forcing a close and reopen. 

[[Ri...]]

Unless there is some specific view/alignment that the drawing dictates, I think that the Polar Caliper Distance would be better suited for this. 

[[Je...]]

Evaluating these features as cylinders rather than circles will provide a defendable result. Your characteristic shall be a cartesian distance.

[[DW...]]

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 Cartesian distance is a center to center measurement, not what is needed here.