These 20 bit, 2020 Color Space TIFF files are made up of 1000 x 1000 pixel squares (16 bit per color and in 2020 color space) with a radial exposure from 0 to 100% saturation. There is a duplicate except for the added scale around the dials.

Experiment please. How do they look with Cinema HD systems? How do they look with P3 systems?

These are included in the DCP (together with the White Radial Squares plate) that can be downloaded here: White | Primary | Secondary Radial Dials DCP

Are they a tool that can be used by  trained but non-technical staff to objectively judge stability or degradation over time?

As always, the pass code is QA_b4_QC