(noun.) measuring instrument for measuring the luminous intensity of a source by comparing it (visually or photoelectrically) with a standard source.

阿尔玛编辑

• An instrument for measuring the strength of a light is called a photometer, and there are many different varieties, just as there are varieties of scales which measure household articles. 伯莎M.克拉克. 科学通论.

欧文整理