The laboratory device includes an elongated handle with ergonomic grips. The device has a center recess for a rod to slide or rotate. The blade head attaches at the distal end of the elongated handle. The rod has geared teeth that interact and mesh with the gears on the blade head allowing the user to manipulate the angle of the blade head via rod. The rod in the proximal position of the handle is disposed at an acute angle relative to the longitudinal axis of the handle such that the blade head and handle are positioned for insertion into and removal of a tissue culture vessel. When the rod is moved distally or rotated the blade head position is disposed perpendicularly, acute or obtusely in relationship to the longitudinal axes of the handle such that the blade head provides optimal raking opportunities for the device to collect cell colonies.