Two methods of measuring peak voltage have been invetigated. In the one method a condenser divider is used, and the voltage on the low-voltage arm of the divider is rectified. In the other the current through a condenser connected across the voltage to be measured is rectified, and the mean current so obtained is a measure of the peak voltage across the condenser. The accuracy of the methods is considered theoretically for different wave-froms, results arrived at by the two methods are compared, and agreement to about 2 parts in 1000 is obtained.