This article presents the design, implementation and characterization of a Littman-Metcalf extended-cavity diode laser. The extended cavity is closed by a roof (retro-reflecting) prism. The wavelength tuning is based on a two degrees-of-freedom monolithic flexurebased mechanism. The linear stroke for cavity length tuning is minimized by optimizing the position of the prism's rotation axis. The wavelength tuning with narrowband emission line is demonstrated in the spectral range of 837 nm to 870 nm.