Description: No special requirements on the material of liquid medium and container, can be used widely Ultrasonic sensors is presented which can be used as non-contact measuring device for liquid level Sensor installed on the bottom of container to detect the height of liquid level No need to open pore on the container tested, easy to install Can detect various toxic substances, strong acid or alkali and liquid level of pure liquid in high-temperature and high-pressure airtight container Specification: Material: Metal Size: Approx. 30x20x12mm/ 1.18x0.79x0.47inch Package Includes: 1 piece Non-contact Liquid Level Sensor Note: Please allow 1-3mm error due to manual measurement, make sure you do not mind before you bid The colors may be different for the different display, please understand