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Leak sensor prevented me from some pain!
(feddit.org)
Had a leak under the sink in our kitchen. I don’t want to imagine what this would have meant on a larger scale, compared the 20€ I spent on the sensor and the 10mins it costed me to install it.
I have the ikea ones (using zigbee), the two aaa batteries in there last about 1/2-1 year.
While not the same as the pictured ones, I can really reccomend them.
Was going to suggest the IKEA one. Pretty decent to use and has a local speaker if you don't have any home assistant devices near by.
The door contacts are good too but I found that I had to connect them a few times before they would register on ZHA