If you need one and don't want to spend a fortune on X-Rite ColorChecker® Passport then have a look at J.Cristina his version is only around $25 and is brilliant. Took less than a week to arrive from the US.
3in1 Photo Reference Tool | J.Cristina Photography Tools
https://www.youtube.com/watch?v=6E-j2ia9ZhA
3in1 Photo Reference Tool | J.Cristina Photography Tools
https://www.youtube.com/watch?v=6E-j2ia9ZhA
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