The Zenyer 101 B is a stainless steel egg grading machine that grades 4000 eggs an hour. There is an option to put a Candler on this grading machine, so you can shine a bright light up through the egg and that can help you detect any cracks. Another add-on for this particular grading machine is an egg printing machine. This can print food grade ink directly onto the shell of the egg. You may print your farm name, logo, date, tracking number or best before date.