I've been happy with our "North Flower Care" BLE plant monitor. Monitors light (which is not useful IMO for an indoor plant), moisture, temperature, and soil fertility. There's a companion app that can record the data and correlate it with what the plant you've configured finds ideal.
I paid $11 for it, which is a lot more reasonable than the current $30, but if it helps a plant you like grow... I don't actively monitor it with an automation, but I recall poking at it with one of the NRF apps and seem to recall that the data format was open enough that you could monitor it outside the official app.
I paid $11 for it, which is a lot more reasonable than the current $30, but if it helps a plant you like grow... I don't actively monitor it with an automation, but I recall poking at it with one of the NRF apps and seem to recall that the data format was open enough that you could monitor it outside the official app.