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The arms of an Extendable Goniometer can extend to 28 inches to measure large joints and retract to 8 inches to measure all but the smallest joints. Unlike standard goniometers that require the examiner to estimate alignment, the length of the extendable arms allows it to lie over anatomical bony landmarks.可伸縮測角儀的臂可以延伸至 28 英寸以測量大關節，縮回至 8 英寸以測量除最小關節..