For example: Agilent E4440A or Anritsu 68369
Multimeter
Fluke 87-V EX
87-V EX (87 V, 87-5, 87V) EX Intrinsically Safe True RMS Multimeter
Manufacturer: Fluke
Fluke 87-V/E2 KIT
87-V/E2 KIT (87 V, 87-5, 87V, E2) Industrial Electrician Combo Kit
Manufacturer: Fluke
Fluke 8845A SU
8845A SU 6.5 digit Precision Multimeter, 35 ppm with software and cable
Manufacturer: Fluke
Fluke 8846A SU
8846A SU 6.5 Digit Precision Multimeter, 24 ppm USB mem with software and cable
Manufacturer: Fluke
Rigol DM3052
Digital Multimeter 5.75 Digit (400,000-count), with LAN/USB and GP-IB
Manufacturer: Rigol
Rigol DM3054
Digital Multimeter 5.75 Digit (400,000-count) w/ USB, LAN, GP-IB, & Multiplexer
Manufacturer: Rigol
Rigol DM3062
Digital Multimeter 6.5 Digit (2,400,000-count) w/ USB, LAN, and GP-IB
Manufacturer: Rigol
Rigol DM3063
Digital Multimeter 6.5 Digit (2,400,000-count) w/ USB & Multiplexer
Manufacturer: Rigol
Rigol DM3064
Digital Multimeter 6.5 Digit (2,400,000-count) w/ USB, LAN, GP-IB & Multiplexer
Manufacturer: Rigol
Tektronix DMM4020
Digital Multimeter, 5.5 digits 0.015% accuracy, dual display
Manufacturer: Tektronix
Keysight / Agilent E1454A
Pattern I/O Pod for the E1451A and E1452A Pattern Modules
Manufacturer: Keysight / Agilent