Nuclear gauges and method of configuration and methods of calibrations of the nuclear gauges are provided. 02 and a second polymer, the first polymer being a continuous phase, and the second polymer being a disperse phase whose index of refraction differs from said continuous phase by greater than about 0. The search light is irradiated onto a hologram 104a recorded in a hologram recording layer 104. In some cases the windows include a ball lens positioned within a channel such that the ball lens and the channel create a seal between the interior and exterior of the sensor head. The antenna can further include a conductive plating disposed at least partially about the dielectric feed in a wedge configuration to influence pattern beam width. The cutting andor pre-creasing unit includes a plurality of operating heads, each one mobile transversely to the direction of feed of the sheet in an independent and autonomous manner with respect to the other operating heads, and conformed to support, move and command a single relative cutting andor pre-creasing tool.