The T4000 Series of industrial trackballs have a high rotational inertia, 3.0 inch ball in a 4.25 inch square footprint design. These rugged pointing devices require 2.03 inches of below panel depth for the quadrature model, and 2.65 inches for units with an interface PCB (Industrial Mouse® Trackball Mouse Pointer). The 3.0 inch diameter precision trackballs can withstand over 6g forces. CTI's industrial trackballs mount to the panel with four screws and comes with a neoprene gasket; which combined with the formed Teflon sealing ring in the anodized aluminum housing is NEMA 12 sealed. The unit is protected from below with a blue anodized aluminum cover that also includes a drain hole. These industrial trackballs and trackball mouse pointers combine all the high reliability features of CTI's trackballs, with an encoder resolution of either 1280 or 640 per rotation, or divisions thereof.