Rotatory plate optical sorting machine Machine's Character: * Quick & easy to chnage different specifications. * Friendly interface for setting measurement items. Adaptable Product: Screws, rivet and product can be hung well on the plate. Inspection items: 1.Roundness 2.Major diameter 3.Minor diameter 4.Spiral angle 5.Pitch 6.Necks down length 7.Included angle 8.Head thickness 9.Head diameter 10.Head crack 11.Hole diameter.