For example: Agilent E4440A or Anritsu 68369
Ground Continuity Testers / Hi-Pot
Hioki 3153
0.2 kV to 5 kV AC Programmable and Fully Remote Controllable Automatic Insulation and Hipot Tester

Manufacturer: Hioki
Associated Research 3500D
3500D Entry-level Dielectric Withstand testers with simple PLC control

Manufacturer: Associated Research
Associated Research 4040AT
AC Hypot and Ground Continuity Test Set

Manufacturer: Associated Research