Handheld inkjet printers are widely used in the outer packaging of food, beverages, wine, etc., as well as various steel pipes, woven bags, gypsum boards, etc., due to their portability, large-capacity rechargeable lithium batteries, and the ability to customize the height of characters according to customer requirements. They can be used in workshops, warehouses, logistics freight yards, offices, etc. It can print production dates, operation serial numbers, production shift numbers, anti-counterfeiting and anti-diversion codes (or invisible characters), company names, graphic ICONS, etc. Handheld inkjet printers are suitable for marking large items or those that are difficult to move.