koban KVD-01-33 Mode D'emploi page 31

● Limit mark
At the narrow top end of the detector housing, there is a red band
which indicates the limit mark.
detector may be inserted between live components or may touch
them.
However, when the detector is used with a contact electrode
extension, the shroud of the extension covers the limit mark. In
some models, from third party manufacturers the shroud is clear
and the limit mark is still visible but in others it is coloured red and
the shroud itself constitutes the limit mark.
RED MARK
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