An instrument for measuring appendicular bone breadths, namely elbow, wrist, knee and ankle, this iodized aluminum tool uses the sliding-branch principle to allow a closer contact between fingers and bone breadths. To aid visualization this tool has a window with contrasting white numbers on a dark background and a yellow indicator line. An outstanding feature is that one of its branches has a set of two Allen-type screws to allow calibration. Included is the Allen wrench. Resolution to 1.0mm.
