Zehntner ZSH 2290, Инструкция по эксплуатации

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Page 13
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Hold the ZSH 2290 at the wheel hubs (5) and move it forward at uniform speed
for a sufficient length (at least 3 mm – see the standards).
Hint: In order to obtain evaluable results it is recommended to move the tester
forward for a sufficient length.
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Inspect the test surface with the naked eye for indentation or scratching.
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Repeat the test using pencils of increasing hardness until the lead of the
pencil penetrates into the coating and a marking occurs over a distance of at
least 3 mm.
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The degree of hardness of this pencil is the pencil hardness (Wolff-Wilborn
hardness) of the coating.
The following degrees of hardness are available:
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For further details see the standards.
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Put the pencil height setter into load release position when not in use.