Fill level inspection ensures that each container is filled with exactly the desired volume of the product during a liquid filling operation. While transparent containers can utilize optical sensors for level detection, difficult to see through containers, such as cans or cartons lined with aluminum, must be scanned using X-rays. When choosing fill level inspection equipment, the size, shape, and opacity of the container must be considered. The production speed, the desired accuracy, and the amount of foaming on the liquid surface are also important parameters to consider. Fill level inspection systems are used to comply with quality control standards.