- <1fA noise

- >200TW input impedance on voltage measurements

- Charge measurements from 10fC to 20μC

- High speed—up to 1200 readings/second

- Interfaces readily with switches, computers, and component handlers

- Cancels voltage and current offsets easily

Precision high resistance and low current measurements. The 5½-digit Model 6514 Electrometer offers 1fA sensitivity, >200T? input impedance on voltage measurements, and charge measurements down to 10fC. Its low noise and drift performance make it ideal for research on single electron devices, highly resistive nanowires and nanotubes, polymers, and electrochemical applications.

https://www.tek.com/keithley-low-level-sensitive-and-specialty-instruments/keithley-high-resistance-low-current-electrom