Aquarium leaks are one of the most feared events for even the most seasoned aquarist – and for good reason. When it comes to leaks, it’s not just about whether you’ll have one, but when it happens, will you catch it in time? Most often if you catch a leak in the early stages, when it is a simple drip, you prevent hundreds, if not thousands of dollars in damage. The LDK includes everything you need to enable your Apex to detect leaks in two locations. Two additional leak detection probes can be purchased separately (4 total). When the LDK detects a leak, your Apex can sound an alarm, send an alert to your mobile device, or take other actions on your aquarium. The LDK provides the ultimate in disaster prevention for this all too common aquarium issue. The LDK includes the FMM – Fluid Monitoring Module that is plug-and-play and will work with any Apex. The FMM has four ports for use with the two included leak detection probes. The other two ports are then available to be used for more leak detection probes, flow sensors, or optical water level sensors.