Examine completed pearl buttons and sort them according to grade.
What does a Button Grader do?
Examines completed pearl buttons and sorts them according to grade: Observes buttons on conveyor belt or worktable, and sorts into containers according to shade and purity of color, and degree of iridescence. Discards buttons with defects, such as spots, chips, cracks, or toolmarks. May examine completed plastic buttons for defects.