In order to expose sufficient surface for mounting heat transfer devices on some manufacturers’ objectives, it is necessary to remove the outer decorative collar which contains written information such as magnification, N.A., etc. The objective wrench is designed to enable the user to isolate the mechanical stress applied to an objective when removing this collar. The rotational force applied to the objective must be applied exclusively to the mounting threads and the cover and not to the internal optics or the spring loaded retracting casing. The wrench is designed with two thread sizes (0.8″ x 36 TPI (RMS) and 25mm x 0.75 mm/thread). It will enable the user to isolate the force necessary to remove the outer sleeve from the core of the objective by securely binding on the external threads of the objective and provide sufficient leverage for removal of the cover.