It’s a bit of a personal choice, but for me, I think using a feeler gauge, or shim, is the most accurate. If a 3 mil shim will go, but a 4 mil shim won’t, you can correct a soft foot within 1 mil. A dial indicator is good, but often the indicator and the wrench need to be in the same place. While using the soft foot program on a laser is a great way to find out if you have a soft foot, it may not give you the exact amount of shim needed, especially if the soft foot is angled. But it is the best way to find out if any residual soft food is going to cause a non-repeatability problem.