Nonrepeatability in measured values of the static breakdown voltage Vs of uniform-field high-pressure gas-discharge gaps necessitates a large number of measurements to be made in order to construct meaningful Vs distribution curves. An apparatus has been constructed which is capable of automatic measurement and recording of breakdown voltage data. This enables results to be obtained under more precise conditions than are possible using normal experimental techniques. The design and performance of this system are discussed with reference to some results obtained for pressurized nitrogen.