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DFRobot Gravity 5V Non-contact Liquid Level Sensor has a Gravity interface and is able to detect 0-100°C conductive liquid levels in non-metallic containers. It has a sensing range of 3mm. Provided with digital quantity output (low), the sensor can be directly used on Arduino UNO for liquid level. Applications include detection of a water tank, beverage machine, water pipe, scientific experiment test tube, etc.