The Huazheng Electric HZDL-130 / HZ5373 Primary Current Injection Tester is designed to generate high primary current for testing busbar protection and current transformers. It offers high measurement accuracy, strong anti-interference capability, and high output power in a compact and lightweight design. The device features a clear LCD display for direct reading of voltage and current, along with functions such as automatic ratio detection, polarity measurement, and indicator lock display for efficient and reliable electrical testing.