The 2720GS Precision DC Calibration System delivers the performance required to calibrate the worlds most accurate DVMs and more. Built-in autoranging digital nullmeter allows calibration of the most accurate DC calibrators also. Features include the following: " DC Voltage Output from 10 nV to 1200 V " Accuracy of 1.6 ppm over 30 days " Stability of 0.25 ppm per 24 hours, resolution of 0.01 ppm " 550 Step Memory to improve repetitive routines " IEEE-488 Interface, local and remote sensing, multi-reference monitoring system, dual alpha-numeric displays, self-diagnostics, many other features