Keysight 3458A-002 - High Stability Reference (4ppm/year) for 3458A
The Keysight 3458A-002 is a high stability reference for the 3458A multimeter.
The long-term accuracy of the 3458A is a remarkable 8 ppm per year − more accurate than many system DMMs are after only a day. Option 002 gives you a higher stability voltage reference specified to 4 ppm/year for the ultimate performance.