I am moving on to the next phase of my home environmental monitor project, and I am kind of at a loss how to accomplish this next part. I had purchased a Honeywell RWD41 leak detector from amazon a while back, which uses a leak detecting cable. I'd like to use the cable in conjunction with my Mega. However, I'm having a hard time figuring out how. When I trigger the sensor cable, I can't detect any changes with my multimeter; eg., resistance stays 0 ohms, diode checker doesn't show anything, etc.
Does anyone know how those things work and how to interface them with an arduino? Or where to start to figure it out?