A device for dissecting an object, such as a cell colony includes a handle and an incision knife module that can dissociate the colony into several colony pieces. In accordance with features of the invention, users can use this dissecting device to cut an object into several pieces quickly and smoothly at a time.

A self-adjusting knife assembly for scoring tenders from chickens, the assembly having a pair of generally parallel handle halves in spaced relation and positively connected by a connector pin, to permit a pair of generally parallel knives, which are mounted on the forward ends of the handle halves, to move toward and away from each other. The connector pin is mounted so that the two handle halves are positively connected to permit relative rocking movement therebetween about a transverse axis disposed in a vertical plane, to thereby permit the pair of knives to self-adjust and follow the opposite sides of the keel bone of the chicken throughout its length, and thereby separate the tenders cleanly from that bone. Spring extends between the forward portions of the two handle halves and constantly gently urges the knives apart. The knives follow the contour of the keel bone, despite its irregularities of shape, as the knives are moved downwardly throughout the length of the keel bone. The normal grip of the scorer urges the knives gently toward each other, as the result of slight downward pressure upon the off-set thumb rest which maintains the knives in contact with the keel bone at each of its sides.