4mm test leads are always used to contact between power supply and load. 4mm safety test leads make the operating more safe. Test clips, test probes, test plugs and test cables are for different usage occasions. Test adaptors are used to convert between BNC and banana plug. Various bandwidth oscilloscope probes are from 20MHz to 500MHz and the max voltage is 40kV. The current probe is also used with the oscilloscope and the max. current is 40A and the max. bandwidth is up to 5MHz. 4mm safety sockets are always installed on the power supply and other equipment. The test mater is very useful in the school and laboratory for cleaning up the test accessories.There are test leads, test cable, test probe, oscilloscope probe, current probe, safety socket and test mater in this category.