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CAT II
Measurement Category II: For measuring circuits of electrical and elec-
tronic equipment that is directly supplied with a mains voltage via a
mains plug. This category also includes all lower categories (e.g. CAT I
for measuring signal and control voltages).
CAT III
Measurement Category III: For measuring circuits of installations in
buildings (e.g. mains sockets or sub-distributions). This category also in-
cludes all lower categories (e.g. CAT II for measuring electrical devices).
Measuring in CAT III is only permitted with test prods with a maximum
free contact length of 4 mm or with cover caps over the test prods.
CAT IV
Measurement Category IV: For measuring at the origin of a low-voltage
installation (e.g. mains distribution, electricity provider’s transfer points to
homes) and outdoors (e.g. when conducting tasks on underground ca-
bles or overhead lines). This category also includes all lower categories.
Measuring in CAT IV is only permitted with test prods with a maximum
free contact length of 4 mm or with cover caps over the test prods.
Earth potential
8 Safety information
Read the operating instructions carefully and especially observe
the safety information. If you do not follow the safety instructions
and information on proper handling, we assume no liability for any
resulting personal injury or damage to property. Such cases will
invalidate the warranty/guarantee.
8.1 General information
This product is not a toy. Keep it out of the reach of children and pets.
Do not leave packaging material lying around carelessly. It may become a dan-
gerous plaything for children.
Should you have any questions or concerns after reading this document, please
contact our technical support or a professional technician.
Maintenance, adjustment and repair work may be carried out only by an expert
or a specialist workshop.
