Insulated Alligator Test Clips Cal Test Electronics Insulated Alligator Test Clips are rated to 1000V CAT III and 600V CAT IV and carry the European Union CE mark. The clips comply with IEC 61010-031 and RoHS 2 standards. The fully insulated alligator test clips provide the extra protection needed in high-category environments. Cal Test Electronics Insulated Alligator Test Clips feature a spring-loaded, three-incisor mouth to ensure a tight grip on screw heads or flat-headed objects.