Hello, I have worked with liquid level sensors before and may be able to help you. Depending on your specific requirements, there are several different types of
liquid level sensor that you can choose from. Capacitive sensors are usually used for non-metallic containers and ultrasonic sensors work well for both metal and non-metallic containers. However, both of these options may not be suitable for very small containers. The other option is a float switch, which is a simple and economical solution for small containers. Keep in mind that each type of sensor has its pros and cons, so you need to think carefully about your specific needs before making a decision. I hope this helps!