The pressure-jump relaxation technique was reviewed recently. It has proven to be a valuable tool in elucidating the mechanism of chemical reactions. In this paper it will be shown that the time range of applicability can be increased and relaxation times as short as 30 μsec can be measured with this technique. This was mainly achieved by reducing mechanical disturbances following the actual pressure jump. Construction and operation of the apparatus has been simplified as well, so that relaxation measurements can be repeated at a rate of 5/min. This allows sampling of the measurements to increase the accuracy of the results. Electronic data recording and processing has been developed by another team.