Hard to beat the ThirdReality Zigbee sensors for solid value and performance. I tested Zooz and some others in the $20 range and they stunk. ThirdReality have been rock solid and right in that $20 spot. I've mentioned this in several places; hopefully the admins don't think I'm some kind of shill! 
Just happy with the result is all. I have some Aeotec 7's but those are like $50 each, so they fall out of the "cheap bulk leak sensor" range.
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