The Electrometer Amplifier is an impedance transformer with extremely high-resistance voltage input and low-resistance output. The unit is used with a connected voltmeter to conduct the following measurements. For quasi-static voltage measurement up to 10 V DC. For quasi-static measurements of voltages greater than 10 V DC with a capacitive voltage divider consisting of capacitors module. As a charge meter as low as 10-9A-Sec, with capacitors module from 1000 nF to 1 nF. For high-resistance measurement of voltages greater than 10 V with an ohmic voltage divider consisting of resistors module. For measurement of very small currents using plug-in resistors module up to 10 G ohm as shunts.