Flood sensors don't need bells and whistles to work well; they just need to tell you when your basement is flooding. You can make your own flood sensor and alarm for a couple bucks, but if you want ...
From Sensors to Sewer Cameras: How Plumbing Technology Detects Problems Before They Become Disasters
A camera may reveal roots, grease or debris, displaced joints, cracks, broken sections, standing water, or foreign objects.
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