Datacolor SpyderCHECKR24

This professional COLOR REFERENCE AND CALIBRATION CARD (24 sRGB colors [pigment] plus gray scale) offers convenient and ultra-portable color correction data and works with a wide array of cameras/capture devices and softwares.

Comes in durable vinyl protective sleeve.

https://www.youtube.com/watch?v=U0jiFi_sErc

https://www.datacolor.com/photography-design/product-overview/spyder-checkr-family/#spydercheckr24