A protection device for an electrical circuit having a load includes a sensor operatively associated with the electrical circuit to sense current changes and voltage fluctuations in the electrical circuit. Input reference information, a bright-field image or a back-scattered electron image is compared with a dark-field image, and it is judged whether or not a correlation value between them or the dark-field image has a predetermined contrast. The skinning tool enables the user to grip and to forcibly pull the skin of a game by placing a sheet of the skin around the mass and engaging the mass through the skin with a collar of rigid material to form a generally arcuate line or contract between the collar and the skin, and the skin and the mass. The saw support section comprises a handle engaging member for receiving and supporting a top handle of the saw and saw plates against which the saw leans.