https://bsac.berkeley.edu/publications/high-senstivity-micromechanical-electrostatic-voltmeter
High-Senstivity Micromechanical Electrostatic Voltmeter | Berkeley Sensor & Actuator Center
electrostatic voltmeterhighmicromechanicalberkeleysensor
https://www.advancedenergy.com/zh-cn/products/sense-and-measurement/electrostatic-voltmeters/non-contacting/trek-370/
Trek 370 Series | Precision, Non-Contact Electrostatic Voltmeter | Advanced Energy
The Trek® 370 employs an electrostatic field-nulling technique to achieve high DC stability and high measurement accuracy — regardless of probe-to-measured...
electrostatic voltmeteradvanced energytrekseriesprecision