Labelers, or labeling machines, are devices that can be used to quickly affix labels. Familiar applications include putting price tags on products at department stores and supermarkets. Labelers are also used to provide product details to avoid problems in logistics such as transportation and storage. Hand labelers, which can be easily operated with a single hand, are useful for attaching price tags and best-before labels. Labels are printed when they are attached, so labeling errors are kept to a minimum. Hand labelers are highly efficient as they do not require a power supply and can be used anywhere. They are made of aluminum or other light materials. Benchtop thermal printers and label dispensers that can also make wide labels are suited for labels containing a lot of information.