The CalTest CT4299-0 Fused Probe easily connects to 4 mm sheathed banana plug leads, which are in turn connected to a Digital Multimeter or other equipment. The small, compact body features an internal, fast acting, ceramic fuse, which can cut power in microseconds during a transient overvoltage, thereby protecting both equipment and more importantly personnel, working in high energy environments. The closer the fuse is to the test point the higher the level of protection.