For example: Agilent E4440A or Anritsu 68369
Multimeter
BK Precision 5390
Premium Digital Multimeters (obsolete 2004- replaced by 2890A)
Manufacturer: BK Precision
BK Precision 5492
5 1/2 Digit Dual Display Bench DMM with 0.012% Basic Accy
Manufacturer: BK Precision
Racal Instruments 6000
Digital Multimeter Amplitude Measurement System
Manufacturer: Racal Instruments