Gravity: Photoelectric High Accuracy Liquid Level Sensor for Arduino (5V)-DFRobot
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CQRobot Ocean: contact water level/liquid level sensor compatible with Raspberry Pi/Arduino. For automatic irrigation systems, aquariums, plants, garden, agriculture, etc.: Amazon.de: Business, Industry & Science
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REES52 Water Level Sensor Depth of Detection Water Sensor for Arduino//High Sensitivity Water Sensor//Water Level Sensor Module Depth of Detection Liquid Surface Height for Arduino M : Amazon.in: Industrial & Scientific
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