Freezer temp sensor

I'm for that, on the door. Even the Visonic 350 is fine for that. Got one one on an old garage frig that takes a deliberate push to close. Tells yah 3 minutes later if it didn't get shut.

But now for the deep chest freezer, that's a different story. That isn't a door issue, that's a fear factor that the thing is gonna give out when I least expect it. And SOOO that is indeed a temperature monitoring job. But I don't like putting the Zigbee sensor + battery in the deep freeze.

So...