A drive belt assembly for a revolving flat card includes a flexible belt. The image sensor module includes a carrier, a light sensing element, and a package body. The center section covers most of the spa water surface and includes an upper film of substantially transparent plastic and a lower film of translucent plastic separated by a gas-filled space. Ag Schottky contact patterns are fabricated using standard liftoff techniques, while the Al ohmic contact patterns are formed using wet chemical etching. or less and at a pressure of from about 250 kPa to about 3000 kPa or less for a time suitable to allow substantially complete transfer of the first ink and the second ink to the membrane; and cooling the assembly to room temperature and removing the first transfer substrate and the second transfer substrate. An electrooptical converter is disposed within the housing including an array of VCSELs and an array of photodiodes rigidly coupled to a ferrule supporting respective fibers of the fiber ribbon.