The label sensor is a necessary part of the label machine to detect whether the label is in place so that the labeler can declare the labeling command.
There are many types of label sensors, such as detecting transparent labels, and detecting non-transparent labels.
There are also two types of labels that can be detected. The standard type of labeling machines of manufacturers is generally equipped with sensors that can detect non-transparent labels. Assuming that the customer's label is transparent, a “transparent label sensor” is required. If both a transparent label and an opaque label are required, then a sensor that can detect transparent and non-transparent labels is not required. If you only want to stick opaque stickers, you don't need to choose a transparent label sensor.