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1 comment of this product found across Reddit:
atxnerdking /r/Hydroponics
2 points
1970-01-18 23:16:08.223 +0000 UTC

How about a float switch on an esp288 Anndason 6 Pieces Plastic PP Float Switch Fish Tank Liquid Water Level Sensor,Model: DP5200 https://www.amazon.com/dp/B072QCHQ2P/ref=cm_sw_r_cp_api_i_V9KICbVVVG9SQ