The Keithley 6517B electrometer is a high-speed precision low-noise (noise level 0.75 fAp-p) 5½-bit multimeter, which is designed to measure low currents with high resolution (from 0.1 fA), high resistances of the peta and exaom (up to 1016 ohms) ranges, voltages from sources with high impedance, charges, temperature and humidity and also contains a built-in
