There is provided new mono-acrylate functionalized hydrophilic silicone monomers containing a polyether with branched linking group, useful in making water absorbing silicone-hydrogel films for contact lens applications. The thickener hereof retains its rheological properties and is not subject to permanent thinning shear. The time difference of arrival for is found for each receiver relative to a predetermined reference receiver. In one embodiment the polymeric matrix is comprised of particles of about 20 nm to about 100 \u03bcm in diameter to which is bound a specific binding pair member. The apparatus also includes a position sensing mechanism to determine positions of the sampling locations on the test object. An activation of a web-clip widget creation icon is detected.