A support arm for supporting a load such as a display device. The support arm includes a housing defining an indicator window, a balancing mechanism in the housing, and an adjustment mechanism to adjust a counterbalancing force or torque provided by the balancing mechanism to counterbalance the weight of the load. The support arm further includes an indicator arrangement visible in the indicator window to provides a visual indication of the relative force or torque provided by the balancing mechanism. The indicator arrangement may include a lens in the indicator window. The indicator arrangement may include indicia to facilitate the visual indication of relative force or torque. The indicator arrangement may include a portion of the adjustment mechanism or balancing mechanism.