The Fluke 5520A builds on the 5500A’s capabilities, extending its workload coverage even further. Its improved accuracy, expanded ranges, and capability to calibrate 5 1/2 and 6 1/2 digit multimeters can cover virtually all your high-performance workload, including:
Handheld and bench meters (analog and digital) up to 6 1/2 digits...

High-precision current transformers
High-permeability permalloy current transformers
Distance mounting current transformers
Low-profile current transformers
PCB solid current transformers...