How to correctly and quickly grade the whole chicken after slaughter?

How to correctly and quickly grade the whole chicken after slaughter? 

The belt conveyor automatic weight sorting machine would help you to handle it perfectly. Speed up to 7200 BPH, weighing accuracy ± 5-10g. 6-26 weight grades for choice. It's widely using in Malaysia, Vietnam, Indonesia, Philippines, Kazakhstan, Uzbekistan, U.A.E, Saudi Arabia, Qatar, Iran, Russia, Serbia, Canada, Chile, Ecuador, Bolivia, Uruguay, Guyana, Nigeria, Mozambique etc.