The LD-7 is the smallest and lightest-weight water leak detector yet it has a very sensitive ground sensor. With the listening rod connected to the ground sensor, listen to the sounds of water-leaks transmitted to faucets, meters and valves. Whether your needs are for water leak surveys or for water leak pinpointing in service lines or in buildings, the LD-7 offers excellent performance at a very reasonable price. The compact water leak detector of only 450gm designed for one-handed operation does not fatigue the operator workingThe characteristic Ball of Patent Pending eliminates the wind noise transmitted through the cable into the Pick-up of high sensitivity.on a site for many hours.