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Ever since a friend showed me what he called a "picómetro" in Spanish, I have been fond of the typescale as a tool particular to the craft of typography, and sure enough over the years I have found it pretty handy for page design and adjustments, even if mostly to compare against the measures in the computer file.
Someone must keep buying typescales, since they seem to be persistently in stock (in art shops in the UK, and I came across one in Dubai not long ago), but I wonder, how useful are they considered by the typophiles? What use are they generally given in these digital times?
And is there a particular typescale that can be recommended or deprecated? So far I am acquainted with:
--Linex DTP 30
--ruler.tex (as found in http://tug.ctan.org/)
--Depth Scale (Technical Sales, London)
Incidentally, this last one (I just got) appears to be seriously wrong in its measures. Anyone who can comment on this?