Detect leaks instantly and get mobile alerts. Monitor up to 4 spaces with the included 2 probes, and add extra probes for even more coverage. Setup takes less than 5 minutes with no programming! Stop leaks before disaster strikes. Aquarists dread leaks, and rightly so—catching them before they become full-blown damage can save hundreds, if not thousands of dollars. The LDK offers optimal protection from this common issue. With the Apex-compatible Fluid Monitoring Module, you can plug-and-play two included leak detection probes and monitor up to 4 locations. It also works with extra probes, flow sensors, and optical water level sensors.