Some monitoring work needs liquid level sensors to detect levels of specific limit of liquid. Some point of level sensors trigger alarm when it reaches the limit needed. Other liquid sensing can be detected by methods like pressure, vibration and ultrasound. With pressure sensor, it measures pressure by creating signal as a indication that it has already expanded. What do you consider in choosing sensory level? For some, they consider the media type in choosing sensor. Selecting the right sensor can also be critical, thus a further study on what sensor to use should be done first prior to the project.