HiLetgo 5pcs LM393 3.3V-5V Soil Moisture Detect Sensor Soil Moisture Sensor Soil Hygrometer Detection for Arduino Automatic Watering System Robot Smart car

Work well they appear to be accurate great for the value not sure about the durability but will let you know later and easy to use

Needed these sensors for a school project. Worked as expected and didn't need to calibrate them. Very happy with my purchase.

I am taking a point off for the wrong indication, you do not want to put this into soil it will corrode. It would also need an AC circuit to make it not corrode which you would need to modify this circuit to support. It is much better as a leak or water detection device. This is what I am using it for, to detect water leaks, in my setup. The device will self destruct if you leave it in water for any length of time. It will plate out you can put some conformal coating on it to help it last a bit longer in water, in the end though it is not the right part for soil moisture detection as advertised. If you are looking for a soil moisture detector you are better off with a capacitive style sensor.

I gave this a 5 star review, mostly because it does it's job. It works great if you are wanting it to detect a water leak. However if you want it to detect soil moisture, it will quickly corrode. There are some hacks to make it last longer by turning the power on/off so current isn't always running through it, but really for what you're paying, you cannot expect the same thing as a $100 moisture sensor. It makes a great DIY "hey look what I can do" project for not much money.

Good product, so far has held up against the application of use, easy to work with the Adriuno, accuracy is dependent upon programing and setup, once complete, it is great for its size.