For example: Agilent E4440A or Anritsu 68369
Hioki
Hioki 3153
0.2 kV to 5 kV AC Programmable and Fully Remote Controllable Automatic Insulation and Hipot Tester

Category: Ground Continuity Testers / Hi-Pot
Hioki 3174
AC Automatic Insulation/Withstanding HiTester

Category: Ground Continuity Testers / Hi-Pot
Hioki 3193-10
DC, 0.5 Hz To 1 MHz, 6-Channel 3-Phase 4-Wire Power Meter with Direct and Clamp Sensor Input

Category: Power Meter
Hioki 3273-50
50MHz 30A AC/DC Current Probe

Category: Probes (Scope, Meters, Logic and Spectrum Analyzers)
Hioki 3274
Wide band DC to 10 MHz/150A AC/DC Current Probe for Oscilloscopes

Category: Probes (Scope, Meters, Logic and Spectrum Analyzers)
Hioki 3275
2MHz 500A AC/DC Current Probe

Category: Probes (Scope, Meters, Logic and Spectrum Analyzers)
Hioki 3276
Wideband DC to 100 MHz/30A AC/DC Current Probe for Oscilloscopes

Category: Probes (Scope, Meters, Logic and Spectrum Analyzers)
Hioki 3333-01
Power Hi-Tester (AC 1Phase 200V, 20A) w/GP-IB

Category: Ground Continuity Testers / Hi-Pot
Hioki 3334-10
AC/DC Power Hi Tester Current Sensor Input

Category: Ground Continuity Testers / Hi-Pot
Hioki 3334-20
AC/DC Power Hi Tester w/GP-IB Low Current Range

Category: Ground Continuity Testers / Hi-Pot
Hioki 3504-50
C Hi-Tester (120 Hz and 1kHz) with GP-IB Binning

Category: Ground Continuity Testers / Hi-Pot
Hioki 3504-60
C Hi-Tester (120 Hz and 1kHz) with GP-IB,Binning,Contact

Category: Ground Continuity Testers / Hi-Pot
Hioki 3561-01
AC Milliohm Hi-Tester/Battery Tester with GP-IB

Category: Ground Continuity Testers / Hi-Pot
Hioki 9010-50
AC Clamp for bench DMM,MR8880-20 (1kHz)

Category: Probes (Scope, Meters, Logic and Spectrum Analyzers)