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Observe the following symbols:
An exclamation mark in a triangle shows important notes in these operating instructions that must be
strictly observed.
The triangle containing a lightning symbol warns against danger of electrical shock or impairment of the
electrical safety of the device.
The “arrow” symbol indicates that special advice and notes on operation are provided.
This device is CE-compliance and meets the applicable European directives.
Protection class 2 (double or reinforced insulation)
Attention, read instructions.
CAT I
Measuring category I for measurements at electrical and electronic devices that are not directly supplied
with mains voltage (e.g. battery-powered devices, protective low voltages, signal and control voltages,
etc.)
CAT II
Measuring category II for measurements at electrical and electronic devices connected to the mains
supply directly with a mains plug. This category also covers all lower categories (e.g. CAT I for measuring
signal and control voltages).
CAT III Measuring category III for measuring in building installation (e.g. outlets or sub-distribution). This category
also covers all lower categories (e.g. CAT II for measuring electronic devices). Measuring operation in
CAT III is only permitted with measuring prods with a maximum free contact length of 4 mm or with cover
caps above the measuring prods.
CAT IV Measuring category IV for measurements at the source of the low-voltage installation (e.g. main distribu-
tion, building handover points of the energy suppliers, etc.), and outdoors (e.g. work at earthing cable,
outdoor line, etc.). This category also contains all lower categories. Measuring operation in CAT IV is only
permitted with measuring prods with a maximum free contact length of 4 mm or with cover caps above
the measuring prods.
Earth potential
