Hanna Instruments HI 931100 - Manual (Page 16)

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Recommendations for Users
Before using these products, make sure that they are entirely
suitable for the environment in which they are used.
Operation of these instruments in residential area could cause
unacceptable interferences to radio and TV equipments, requiring
the operator to take all necessary steps to correct interferences.
Any variation introduced by the user to the supplied equipment
may degrade the instruments' EMC performance.
To avoid electrical shock, do not use these instruments when
voltages at the measurement surface exceed 24 Vac or 60 Vdc.
To avoid damages or burns, do not perform any measurement in
microwave ovens.
CE DECLARATION OF CONFORMITY