The online ground resistance detector developed by Sunlight does not change the structure of the original grounding system, and uses online monitoring technology such as non-contact measurement, which will not affect the grounding effect and normal operation of objects. There is no need for self-testing and real-time detection, and the product can be installed and used as a single product, or it can be formed into a wired network system or wireless network component system. With the support of the system, the data can be saved. Through the display of the accumulated data curve, you can intuitively see the changing trend of the grounding network and judge whether the grounding network is in good condition or not.