Built around a micromirror-based spatial light modulator, a mechanical beam profiler takes advantage of the micromirrors' digital qualities, making measurements that are intrinsically repeatable. Even fluctuating beams can be measured.Built around a micromirror-based spatial light modulator, a mechanical beam profiler takes advantage of the micromirrors' digital qualities, making measurements that are intrinsically repeatable. Even fluctuating beams can be measured.