Searching for a type tool

Bill Amatneek
Bill Amatneek Posts: 2
in Resources
I used to have a 8.5 x 11” transparency that I printed from the web. One can buy it as well in clear plastic.
It had various typesetting "tools" on it. For instance it had a sets of short horizontal lines, each set of which depicted a leading size:

10 points [just improvising here]
–––––
–––––
–––––

20 points
–––––

–––––

–––––

You could overlay printed text with these various sizes until one matched, telling you the number of points of leading in that text.
It had other devices as well.

I cannot find the name of this overlay tool.
Any help would be most appreciated.
MTIA.

Best regards to all,
Bill Amatneek

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