Martindale vipdlok150 with vi 15000 voltage indicator and pd690 proving device martindale vipdlok150 the martindale vipdlok150 lock out kit is the complete solution for safe isolation it contains the vi 15000 voltage indicator matching pd690 proving device as well as a complete lock out kit it is supplied in soft carry casessafe electrical work now requires the use of a voltage indicator that has been proved to be functional by checking it with a proving device before and after usethe v