Isoprobe IV 100:1 500MHz test probe set, CAT III. Isoprobe IV 100:1 500MHz test probe set, comprising of a an Isoprobe IV 100:1 500Mhz test lead and a comprehensive assortment of accessories for use with the primary lead, including insulating sleeve, hook clip, uninsulated push-on BNC adaptor and more. The Isoprobe test lead is built on a highly flexible PVC insulated coaxial lead with a BNC plug with built in compensation unit and a wide frequency range combined with low input resistance and a facility for connecting the reference lead in to the front part of the probe. Rated voltage 1000V, CAT III (600V CAT IV) (Max.3540 V, CAT I) Dividing ratio 100:1 Input capacitance 4.6 pF Input resistance 100 M Frequency range 0-500 Mhz 120cm in length