Kui näidiku esmaelement skaalal on aknast nähtav ja see liigub pidevalt, peab vaateakna mõõde olema võrdne 1,5-kordse kahe järjestikuse skaalamärgi vahelise kaugusega.
Näidiku esmaelemendiks on tavaliselt mõõtevahendi näidiku skaalajaotuse väärtus.
When the first element of an indicating device has only of its scale visible through a window and has a continuous movement, the dimension of that window shall be at equal to 1,5 times the distance between two consecutive graduated scale marks.
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