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19 points
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A soil moisture measuring device to tell when plants need watering. 2 for $10 on amazon.

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3 points

I bought one too andI love mine. I feel like my plants like it too!

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2 points

Do they really work?

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3 points

Yes they work well. No batteries needed. They give clear indication of dry/moist/soggy. I was over-watering and killing plants before I bought one.

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3 points

Why wouldn’t they? It just measures electrical resistance of the soil, less moisture means more resistance. Nice and simple.

I have cheap one connected to arduino, and small water pump conected to it too. It works nicely.

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1 point

The soil composition, minerals and nutrients can change the eletrical resistance. Thats what i read somewhere.

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