Tangent Screen Wand

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Test object is inserted into the fabric leaving only the object visible. Half-turn rotation obscures the test object behind the wand.
Alternating the rotation, objects can be made to disappear and reappear for confirmation
response. 
18" (45.72 cm) Wand . . . . . . . . . . . .920000
39" (1 m) Wand . . . . . . . . . . . . . . . .922000