Response to how to evalulateand compare negatives

thanks everyone, I plan on takkng some courses and hopefully meet some more experienced photographers. I'm also gearing up to print all of these negs so I can get some idea of how they all print. In "The Negative" Adams mentions a Kodak product, a type of "chart" or comparison step guide for evaluation of neg densisity, he does not give much detail but does anyone know what this is and if it would be useful?

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