ECOWITT Soil Moisture Meter WH51, Plant Water Monitor, Soild Hygrometer Sensor for Gardening, Farming Home, indoor and outdoor plants, 868 MHZ

Brilliant product - works well and can link up to Home Assistant

These soil sensors allow for better dialing in of soil moisture and go hand in hand with the ecowitt WiFi gateway which hooks directly to your Internet router, the info you get definitely helps new growers get better in a shorter time and it can even help the seasoned gardener to take they're garden to the next level

I bought this to complement my Ecowitt weather station and several other sensors. I noticed that this sensor has a much shorter range than my other sensors and I had to move my gateway for it to pick up the signal. After that, it works fine and gives readings that seem plausible. Time will tell how good the battery life is.

I was going away on a month-long holiday and needed a way to automate the monitoring and watering of my plants. There are loads of DIY solutions on Amazon that use a simple controller or Arduino, but none have an easy interface for me to monitor remotely. This seems to be the only one from a reputable brand with the ability to connect to WiFi (via a bridge) and I already have an Ecowitt weather station, so the cost of the bridge and the setup is already covered. Make sure you use a fresh battery to set up the sensor. After setup, a rechargeable battery can be used and it will continue to work down to 0.9V. UPDATE 2023: Make sure you use the rubber cap hidden underneath the box to cover the battery door; otherwise, there could be water ingress in rainy weather.

Very easy to setup, literally slipped an AA battery into the unit and it appeared on my ecowitt app. I placed it in a glass of water and waited a minute or so and saw it updated to 100% moisture, so I assume it works. I have now inserted it next to a pot planted Acer tree and it indicated a 21% moisture level - Acers supposedly like a 20-40% moisture level so I've setup a Home Assistant automation to turn on my irrigation when it hits below 20 and turn off around 30% so far working great!

This is used to monitor the moisture content for my tomatoes

An excellent product to add you to your Ecowitt weather station (up to 8 soil moisture sensors in total can be added to the HP2551/HP3500/HP3501stations) which is is painless to pair (just connect the battery!) also super easy to accurately calibrate. Extraordinary battery from a single AA cell and a broadcasting range of 100m and updates every 70 seconds makes this a really useful add-on for any keen gardener or farmer for inside or outside use.

This is dead easy to use, pairs well with the gateway, and reliably sends data to it. I haven't gone to great lengths to calibrate it so I don't know how accurate it is, but it reads low values after prolonged dry spells and higher values after rainfall or watering the garden, so it at least passes a basic face validity check. My main problem with it is that it is not well made and breaks easily. I've already got through 2 of them in less than a year. If you can put it in a bit of soil that is unlikely ever to be touched by anything, then so much the better.