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A comment on Large-scale ‘sand battery’ goes online in Finland. Parent comment

Re:Large-scale ‘sand battery’ goes online in Finland by pickup191 on Thursday July 07, 2022 @01:26AM (#32010221)
What’s the name of this 20 dollar device?!
[ Parent | on HN ]
Re:Large-scale ‘sand battery’ goes online in Finland by com2kid on Thursday July 07, 2022 @02:00AM (#32010421)
Just a water tank moisture detector, e.g. https://a.co/0ujkOuD
[ Parent | on HN ]