The BROM (Back Range of Motion Instrument) has set the standard for accurate, repeatable measurements of the lumbar and thoracic spine. The BROM uses a patented inclinometer based instrument for measuring rotation and lateral side bend in the preferred upright position. The magnetic inclinometer and reference eliminate hip substitution errors. The BROM is the only instrument that can measure lumbar rotation accurately. The BROM Basic includes two Universal Inclinometers for measuring flexion and extension of the lumbar spine.