Water scarcity caused by ever increasing demand in the present world has made it a precious commodity. Surveys carried out in different countries reveal that 15-30% of water is wasted in leakages in the pipelines. Plugging these leakages can give more capacity and revenue to water supply departments as well as offer unpolluted and better quality commodity to consumers. This calls for a highly sensitive and precise instrument capable of detecting any type of leak on any type of pipeline laid deep underground. Our WLD 90 completely satisfies the demand of such instrument for the job.