Designed to measure nighttime retroreflection (RA) on traffic signs, high visibility clothing, conspicuity tapes, and license plates, our retroreflectometer features an advanced optical system capable of measuring up to 4 simultaneous observation angles. The basic illumination angle (β) can be set at −4° or 5°, and different illumination angles can be achieved using an angle adapter. This capability allows for the synchronization with observation angles to ensure precise retroreflection determination in accordance with international standards.