A color detecting device comprising a head (14) supported on an arm (30) for oscillatory motion over the product (11) being color measured to render a signal responsive to the average color of the product. A height detector (44) provides a signal indicating the distance between the product and head and...http://www.google.es/patents/US4707138?utm_source=gb-gplus-sharePatente US4707138 - Color measuring and control device
