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Descriptive markings shall be indelible and of a size, shape and clarity that permit legibility under normal conditions of use.
They shall be grouped together in a clearly visible place on the instrument, either on a descriptive plate fixed near the indicating device or on the indicating device itself. It shall be possible to seal the plate bearing the markings, unless it cannot be removed without being destroyed.
The descriptive markings may be shown on a programmable display which is controlled by software. In this case, means shall be provided for any access to reprogramming of the markings to be automatically and non-erasably recorded, e.g. by traceable access software. When a programmable display is used, the plate of the instrument shall bear at least the following markings:
type and designation of the instrument
name or identification mark of the manufacturer
pattern approval number
electrical supply voltage
electrical supply frequency
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