Resistors
Resistors may be damaged by strong shock like dropping and cause trouble, so be carefully handling. And please don't touch directly with bare hands because there is bad influence for the characteristics of the resistors due to high resistance value.
High voltage instruments
High voltage instruments may be used at lethal voltages.
Please understand sufficiently the operating manual of the instrument.
It must not be used or incorporated into a test set-up by unqualified personnel.