A clamping device for combined floors includes a base member having a snapper, a first rib and a second rib extending upwardly form the base member and adapted to be received in the combined floors for connecting the combined floors. A transparent material for enlarging the shape is coated on each microlens to cover the gaps between the microlens. Additionally, the invention involves using optical equipment in conjunction with the analytical equipment to analyze samples and control the operation thereof. The connecting rod has a piston attachment formed at one end for being connected with a piston pin which is connected with the piston. In some embodiments, the registration of a color camera with a depth camera may include mapping centroids identified within a first color image captured by the color camera with corresponding centroids identified within an undistorted intensity image captured by the depth camera.