It looks fantastic but I'm not using CC.
(Yes, I'm an outdated guy...)
I’m a developer of Size Marks, if you have trouble using it, please let me know.
P. S. It is a script, not a plugin :)
this is awesomely useful! Thanks! can I use it in Illustrator?
Sorry, no. The script works under PS only.
This is incredibly useful! Thank you for sharing this :)
Fantastic script! Thank you!
Fantastic. Would have saved me so much time when my deliverables were still static files. If this used the relatively auto-guides somehow, that would be incredible.
Than you're searching for Specctr ;) http://www.specctr.com/