Dwyer PSX2 - Manual (Page 66)

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8.7 How to fold gage paper
(used for determining mounting position)
(1) Prepare a sheet of paper (vinyl sheet) of 4 D or
more in length and 200 mm (7.9") or longer in width
(D is preferable) as shown below.
4D
Parallel
200 mm or
D or larger
About 100 mm
(2) Draw a line intersecting at right angles with the
longest sides about 100 mm (3.9") from one paper end.
Bulletin F-9-PUX2