Your laboratory measurements are only as accurate as your reference standards. How do you ensure the ongoing accuracy of these lab standards? Keysight labs have the same requirement, so we have several locations that maintain primary standards or standards directly calibrated by national labs (NIST, NPL, NRC, etc.). Now you can send your reference standards (electrical, physical, dimensional, optical, etc.) to Keysight for calibration. This video provides an overview of capabilities and uncertainties (accuracy).