These two videos showcase some of the technology behind the SFP1 surface finish probe option for Renishaw's Revo five-axis measuring head.
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The probe in the first video (top) is not the SFP1, but rather, Renishaw's RSP2 tip-scanning probe for dimensional measurement. However, the SFP1 relies on the same laser tip-sensing technology to measure surface finishes ranging from 6.3 to 0.5 Ra.

The second video (bottom) demonstrates how the Revo’s rotary B axis and the SFP1 probe’s passive C axis work together to change the orientation of the stylus.