Essential in the Functional Manual Therapy assessment of leg length discrepancy is the ability to rapidly perform A-B-A testing with functional tests between different heights of lifts. This assortment of various thicknesses of linoleum, allows the therapist to vary the height by 1/16″ at a time up to a total height of 3/4″. It is designed as a long rectangle to allow for full foot assessment of leg length, as to not have ankle position impact the outcomes of the functional tests. Move past measurements for leg length discrepancy, and progress to determining lift height by the amount that creates the best performance in functional tests to prescribe appropriate adaptive devices.