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CQRobot Contact Water/Liquid Level Sensor Compatible with Raspberry Pi/Arduino. for Automatic Irrigation Systems, Aquariums, Plants, in The Garden, in Agriculture etc. Single Point Contact Type AUTO_bestsellers_Oct2025 Auto On at Night withCQRobot Contact Water Liquid Level Sensor Compatible with Raspberry Pi Arduino. for Automatic Irrigation Systems, Aquariums, Plants, in The Garden, in Agriculture etc. Product Features Contact Water Liquid Level Sensor, This is a photoelectric water liquid level sensor that is operates using optical principles. Open collector output mode, suitable for connecting various circuits and product applications. The sensor has no mechanical parts, requires no