The invention concerns a linear pneumatic gripper that has a gripper body comprising a base element, in which a chamber has been provided for a piston and which supports two drive levers oscillating on relative fulcrums or pins and connected to the piston, and a guide head associated with the base element and having a guide groove for two jaws connected to the drive levers. In the module, a top case is provided with a horizontal plane part and a vertical plane part bent vertically from the horizontal plane part to enclose the edge of the liquid crystal display panel. The calibration factor controls an output frequency of the timing circuit.