Testboy Testavit Schuki 3 LCD Manuel D'utilisation page 21

Operation
If the tester indicates a fault condition in the wiring under test,
always investigate the wiring or have the wiring investigated by
a competent person.
Do not contact accross two phases of a three phase supply.
The tester will not correctly test circuits using isolation trans-
former.
Before testing, disconnect any loads from the circuits of all
socket outlet in same distribution board as possible with the
socket under test. Some loads connected may lead to measur-
ing error.
Use caution with voltages above 30 V ac as a shock hazard
may exist.
FOR USE BY COMPETENT PERSONS
Anyone using this instrument should be knowledgeable and
trained about the risks involved with measuring voltage, espe-
cially in an industrial setting, and the importance of taking safety
precautions and of testing the instrument before and after using
it to ensure that it is in good working condition.
Definition of measurement categories:
Measurement category II:
Measurement category II is applicable to test and measuring
circuits connected directly to utilization points (socket outlets
and similar points) of the low-voltage mains installation. Typical
short-circuit current is < 10 kA.
Measurement category III:
Measurement category III is applicable to test and measuring
circuits connected to the distribution part of the building's low-
voltage mains installation. Typical short-circuit current is
< 50 kA.
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Testavit Schuki 3 LCD 21