Femto/Picoammeter 0.01fA, 6 1/2 Digits. The Agilent (now Keysight) B2981A is a graphical Femto/Picoammeter that measures current with down to 0.01 fA resolution. It features trend chart (roll view) and histogram view to capture transient behavior and make quick statistical analysis. Measurement specifications: Resolution min.: 0.01 fA Current range: 0.01 fA to 20 mA Speed: 20,000 readings/s Burden voltage: < 20 µV Time domain view to capture transients Histogram view to perform quick data analysis Setup integrity checker software (optional) Easy-to-use auto navigation Furnished with high-performance Keysight triaxial cable (1.5 m) 4.3 color LCD display Interfaces: Ethernet/LXI, USB 2.0, GPIB, SCPI-compatible"