Electrometer 10kV

[Physikfan]

The picture shows an electrostatic voltmeter with light pointer for a maximum of 10 kV.



My questions to all:

Please, who else has an electrostatic voltmeter in his instrument collection?
Do you have some experience in dealing with voltage measurement by electrometers?
Have you perhaps measured the self-capacitance and the internal resistance of your device?