Check out this discussion where this came up.
http://986forum.com/forums/boxster-general-discussions/80021-smoking-engine-after-coil-spark-plug-change.html#post633634
Here is a youtube review.
https://youtu.be/Caw9xWiIoE0
I believe he mentions you can rent one for 10 days from Durametric for 10 days for $50.
A forum poster JFPinPA recommends the Durametric over Foxwell for reasons he mentions in the first discussion.