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SePem 155 is a noise logger for monitoring water pipe networks. In addition to conventional leak detection survey methods, SePem 155 loggers are an effective, permanent monitoring tool to quickly identify leaks that may never reach the surface. The SePem 150 is compact which allows the logger to be placed in valve boxes, meter pits, and on unusual contact points. The highly sensitive microphone on this logger enables programmed monitoring of distances up to 1,600 linear feet of pipe between loggers.