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Top 5 Positive Customer Reviews for plant sensor
It works. I had trouble with it at first, it started "ticking" like crazy as soon as I put in the battery. But the problem seemed the battery, not the device. After inserting a good battery the sound changed to a chirp. At least I know now what it sounds like when the battery is failing. It definitely makes a subtle chirping sound when the soil gets dry. Don't know about the silence at night, because I didn't wait for dark. Make sure you use a good battery.