The phrase "reflected energy" is the key clue here, it points to an optical or light-based sensing method rather than a mechanical weighing pan. Among devices used in tablet and capsule manufacturing, filling machines like Rotofill and orientation/sorting units like Rotosort are not weight-monitoring instruments at all, and weight-checking units such as Vericap-1200 are generally built around direct mechanical weighing rather than optical reflection. Rotoweight is specifically designed as an online monitor that senses reflected light energy from each unit passing through the line to continuously track weight variation without stopping production.
Since only this device is built around the reflected-energy sensing principle described in the question, it is the one being asked for.
Therefore, the correct answer is Rotoweight.