Contestor JCT-3 Features: Contester supports self-inspections and complete inspection of electrical electrical electrical circuits including the main ELCB and other indoor circuit reception; Neutral wire (N) and ground lines can be detected. In the power inspection and bulk checking the wiring in the live line state, it is easy to carry. Eco design that does not require batteries. (No charging required): The "ground circuit" test function allows you to easily check that the ELCB is installed on the train that is being tested. Even if there is a mix of outlets with ground poles and outlets without ground poles, you can test it without switching operation.