reflectometer
/rɪˌflɛkˈtɑmɪtər/
noun
- An instrument that measures the amount of light or other radiation reflected from a surface.
- The scientist used a reflectometer to measure how much sunlight the new paint reflects.
- Engineers tested the road markings with a reflectometer to ensure they were visible at night.
- The art conservator used a reflectometer to analyze the reflectivity of the old painting's varnish.