Quantum Devices, Inc. Model QR12 provides an improved feedback solution in applications typically using modular encoders. With an over all height of less than one inch and the stability of a bearing encoder design, the model QR12 can provide significant performance upgrades in applications limited by traditional modular encoder solutions. Outputs consist of a quadrature with index pulse and three-phase commutation. A flexible member allows for much greater tail shaft run out and TIR than can be tolerated by modular encoder designs, plus it provides 30 degrees of rotation for commutation timing.