Schutzinger 1000V CAT II 4mm Socket Safety Needle Point Test Probes. Schutzinger CAT II safety test probes offered in red and black, featuring a 4mm axial socket and a dual ended insert, both ends of this reversible insert can be used individually. One end has a 5 mm spring loaded steel tip, the other end a rigid, hardened steel tip with a 4 mm lamella-basket. These safety test probes are rated at 32A and 1000V with nickel plated contact parts. Rated at 32A 1000 V CAT II Operating temperature -25 to +80 °C Transition resistance 5 m Spring loaded tip - Lamella Basket Nickel Plated