Test probes are just as necessary for precise measurement of current, for example, as appropriate leads. Tests can be carried out on different components or devices depending on the version. Insulation prevents short-circuits and damage. Particularly fine probes are suitable for probing SMD parts on densely packed circuit boards, for example. They can also penetrate layers of varnish and insulation. Rotatable gripping pliers and a flexible shaft mean they can be used in hard-to-reach areas. Magnetic adapters ease contact with screw heads.