What is a fun gadget you have purchased that has added value to your life?

Fumbles@lemmy.world to Asklemmy@lemmy.ml – 393 points –
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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.

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