SureGrip Fused Test Probes with built-in replaceable fuses for additional measurement protection. If the probe fuse does blow, these fused test probes will still allow the meter to indicate live voltage, helping to prevent a possible misreading of no voltage present. These modular probes mount onto any standard modular test leads, for instance the Fluke TL221, TL222, or TL224. Rated to CAT III 1000V, these probes have removable tip guards for reduced probe tip exposure.