For businesses that need identification markings on compatible metal surfaces, a handheld inkjet printer can provide a portable coding solution when paired with suitable ink. It can be used to print serial numbers, model references, batch codes, production information, logos, and other markings. The handheld format makes it convenient for large components, tools, equipment parts, and metal containers that may not easily fit conventional desktop printers. Suitable ink selection helps improve adhesion and durability on metal. Applications can include engineering workshops, hardware manufacturing, machinery components, electrical equipment, automotive parts, and industrial packaging where traceable identification is required.