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A current and a voltage sensor have been combined into a single unit. This unit has been developed for measurements of very fast transients on high-voltage (HV) lines; its large bandwidth when combined with suitable integrators, also allows power frequency measurements. Sufficient insulation with respect to the HC conductor is guaranteed by SF6-gas at a pressure of about 1 bar. The unit can be directly series connected in HV conductors and bushings up to about 150 kV; scaling of the dimensions will allow higher voltages. Both sensors feature a large bandwidth of up to several tens of MHz, a high linearity since no saturable iron is used, good properties with respect to electromagnetic compatibility (EMC), and a simple construction.