9103 USB Picoammeter stock right here

Accurately Measure and Record Low DC Current. ASCII programmable, dual-polarity DC current from picoamps to milliamps. It can be biased with an optional built-in fixed +90V DC bias, or your own low-noise DC power supply.

Ranges 2 nA to 2 mA, .001 nA to 2.499 mA
Programmability: ASCII command interface
Automatic or manual range selection
Interval or Single Sampling
Automatic Input Grounding

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