Martindale pc15250 phase rotation and continuity indicator martindale marpc15250 p the martindale pc15250 is a simple and quick 3 phase continuity and rotation indicator it gives a fast and effective identification of worn or unmarked cables and ensures 3 phase outlets and machines are wired correctly p p the retractable gs38 probe shields give a choice between long exposed tips for reaching inaccessible contacts and safer shorter lengths for increased safety supplied with one fused c