No issues with setup or adoption via HA, it did take time to stabilize the reading and after adding water took a time to reach the real humidity value (see image over 2 weeks)

I have no way to verify the results, but the results »seem« right. Honestly, I don't really care how accurate it is, I just want something to give me some information to remind me to water them. It serves that function well

Funktioniert mit Zigbee2MQTT, ganz nativ. Gehäuse ist etwas größer und dicker als eine AA Batterie (die auch drinnen ist). Passt alles. Danke.

While I don't have any way to verify the results they seem quite accurate. I can clearly see the soil humidity change as I water my plants and it slowly changes throughout the day.They were very easy to setup and just worked out of the box with Home Assistant ZHA.I would say these are really worth it for the price. As an all in one low powered solution. It would be difficult to custom build something with parts for the same price.

IT PAIRS WITH H@BIT&T ELEVATION WITHOUT ISSUES, 2 year battery life. Driver available in the HUB

I recently had a problem with root rot in my indoor Tea Rose. I'd been looking for a zigbee soil monitor for a while and my discovery of this lined up with my holiday shopping, so it seemed like the time to give it a try.The Good:Connects immediately to SmartThings, and so will also work with most other smart home ecosystems.Measures both temperature and "humidity".Waterproof (safe for outdoor use).Includes a battery.The Bad:What the description doesn't tell you - this thing is HUGE. Way bigger than the illustrations let on.The default SmartThings driver does not include battery level, but the device does report it.The ThirdReality Temp/Humidity driver includes battery, but only reports temperature OR humidity on the icon (you have to open the device in the app to see both readings).The Ugly:Digital soil meters are still not very common. This means there's no standards for measuring soil moisture and no standards for when to water various plants based on that digital reading.Humidity readings are reported very infrequently and take a while to update when the moisture level changes or if the meter is removed and replaced.I've had this for a couple weeks now. Overall I like it and would recommend, but it's not going to immediately solve all of your over/under watering problems. Set your expectations.It's not clear in the description or documentation how this device measures humidity. However, the design of the sensor post suggests it's measuring soil conductivity, like most analog moisture meters. It's also not clear how the reading is calibrated. And of course there are no instructions regarding what moisture levels are appropriate for what plants (though this is understandable, since ThirdReality is a tech company not a gardening company). What all of this means is that you'll have to do some science: Water according to your normal schedule and monitor the readings from this device in order to "calibrate" yourself.Once you've gone through a few watering cycles and seen how this reads, you can set your automations or alerts accordingly.Removing and replacing the sensor will alter its readings! I tested removing and replacing the meter. The reading went from 36% before to 0% removed and 10% after. I dug down a couple inches to confirm that the soil is still damp down below. This is likely just due to poor soil contact with the sensor probe, which will improve with watering and soil settling. This means that once you've place it and started your "calibration", it should stay put; removing it will require you to "recalibrate".For a version 2, I think they could reduce the size quite a bit if they tried. A smaller sensor would be nice, and most of the size is to accommodate the battery. I'd also like to see a version that could be externally or solar powered to reduce battery waste. And updating the ThirdReality ST driver to display both temp and humidity in the device thumbnail would be nice. But most of all, including a chart of "ideal water levels" for some common plants would elevate this substantially, making it a lot more user friendly for beginners or those trying to compensate for a "black thumb" (including this in a custom driver would be AMAZING).Still, after all that, tl;dr: It's worth the $20 and if you're reading this review then you should get it. But let's also hope they come out with an upgrade.I will probably buy several more of these and I'm considering the watering kit too.