We use the pressure recorders to perform pressure surveys on sections of line. We'll place the recorders at intervals along a given given pipeline, the data is then used to see where we might be loosing gas due to a leak or other anomaly. Our system is aging and we have a lot of leaks. These transmitters pay for themselves on the first job they are used on, by pinpointing problem areas and reducing the time it takes to identify the problem. (Posted on 1/10/12)