Using this sensor is a breeze. First, connect the Liquid Level Sensor Probe to the Liquid Level Sensor Adapter using the Gravity Digital 3 - Pin Cable. Then, attach the adapter to your Arduino with the 'Gravity' interface. Once it's all set up, you can start detecting the liquid level. If you want to adjust the sensitivity, just press the SET button to choose from four different levels. When using it, keep in mind that although it can work with many types of liquids and containers, avoid exposing it to extreme temperatures or physical shocks. To maintain the sensor, clean it gently with a soft, dry cloth every once in a while. Don't use any harsh chemicals as they might damage the sensor.