The Syahi Handy Coder 12mm is a hand-held roller coder for printing batch numbers and expiry dates on cartons. It has an ink roller mounted above a grooved type drum on side brackets, with a handle stub on top, and comes with a sheet of moulded characters covering letters, numbers and symbols for setting up the code. The chosen characters are fitted into the drum grooves and the coder is rolled across the carton surface to print the batch and date line.