We have a VP2 inside, and a floating temperature bouy on our small Lake in upstate NY. The float has two Weatherlink 6372 modules on it, each with a temperature sensor to detect water temp at different depths (currently 2' and 25' below water surface). We wish to monitor a third temperature depth. Looks like we'll have to buy another 6372, but seem to be unable to locate a temp sensor with cable length of about 35-50'. Any suggestions?