Engloid
Valuable Member
The one I posted above works great. It's pretty sensitive. Wet concrete or carpet will set it off. It doesn't have to be puddled water to make it go off. If you see the wired part on it, that's the bottom of the unit, but it pops off for other mounting methods. I actually hang it on a wire down in my livestock tank when I'm topping off, so when it gets so full, it goes off and reminds me to turn off the water. You may want to bite the bullet and pay about $9 for one at Harbor Freight. It will be much cheaper than a divorce. 
