I tried both of them: (1)comicbookgradingtool and (2)comics.ha.com/tutorial/comics-grading.s?show=comicdefinitions
POV: both instruments are useful in their ways, better to grade the book hybridly, using two tools at the same time. And I will agree with suggestion about etanick tutorial on Youtube, they are really informative and will guide you through grading proccess.
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Editor at Paperell(https://paperell.com/buy-college-research-paper) where you can buy college research paper works online for yourself. I would love to discuss about comics of the late of 70s.I can`t remember when I exactly read my first book, but I remember about how subversive and liberated I felt as a finished. My favorite quote is - “You can create your hero as a psychopath, you might draw gut-splattering violence, and name it a "graphic-story novel," but comic books will remain being incredibly dumb."