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Extra-long arms determine exact alignment.
Lightweight, durable ABS plastic construction. Chromium-plated brass arms extend up to 18" (46cm) to measure large joints and retract to 4-1/2" (11cm) to measure smaller joints. Added arm length makes it possible to determine exact alignment. Arms rotate 360° in both directions. Reading window offers 4x magnification. Dual-scale index dial allows readings of 0° to 180° or 180° to 0° in 1° increments. Features a resistance swivel.
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