SKS Hirschmann Test Clips Accessories Test probe 608348 - SKS Hirschmann 973369100, The SKS Hirschmann PRUEF 3 sw is a black test probe fitted with a 4 mm jack connector and rated for CAT I applications. It features a spring-loaded mechanism for secure contact in testing electrical circuits. This probe is typically used in laboratory and electronic equipment testing environments. SKS Hirschmann 973369100 PRUEF 3 test probe 4mm jack CAT I Black 1pc