Keysight B2901BL Precision Source Measure Unit: 1pA resolution, 21V, 1.5A, Open Box
Keysight B2901BL Precision Source Measure Unit: 1pA resolution, 21V, 1.5A, 4-quadrant operation, 100nV/10fA sensitivity, 0.012% basic accuracy, built-in SMU sequencing, and GPIB, LAN, and USB interfaces.
Keysight B2910BL Precision Source Measure Unit: 10fA current resolution 210 V/1.5 A voltage and current sourcing 4-quadrant operation Built-in digitizer for fast transient capture GPIB, USB, and LAN interfaces