Handy Coder Handy coder, which also goes with the name batch coder, is a machine used to mark various information like batch number, date of manufacturing and expiry, net weight, etc. on absorbent (porous) non-absorbent (non-porous) surfaces. Working Assemble the handy coder, ink roller, and type box. For composing, stick the letter and numbers on the stereo roller according to your requirement. Spread the ink on an ink roller and attach it to the handy coder. The handy coder is ready to use. Applications This portable and handy batch coder finds its application in the engineering and automotive industries. It is used on woven crates, sacks, wooden boxes, and leather materials.