Leveling Platform with 20cm Field, for ISIS QA-1 Phantom

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Leveling Platform with 20cm Field, for ISIS QA-1 Phantom.

The leveling platform is 1 cm thick black acrylic plate topped with white engraving material and is 22.9 cm wide and 23.2 cm long.  The leveling platform has three leveling screws and is engraved with dashed crosshairs, a dashed 7 cm square rotated 45° to intersect with a non-rotated dashed 10 cm square, a dashed 20 cm square and a dashed 20 cm diameter circle.  The dashes are etched deep and long enough to lay the tungsten pins in the dashes.  There is also a 14 cm square for placement of the phantom cube and an adjustable corner guide with two screws at one corner to prevent rotation of the phantom cube.  To set corner guide loosen the screws, adjust the corner guide to be snug to the phantom cube when in the correct position then tighten the screws.  To connect the leveling platform to the alignment bar or adjustable table centering bar, fit the pin in either bar into a grove on the leveling platform.  Two sides of the leveling platform have three alignment grooves, one at center and one on either side at 7 cm from center.