photometer

名词 photometer:

1. measuring instrument for measuring the luminous intensity of a source by comparing it (visually or photoelectrically) with a standard source
2. photographic equipment that measures the intensity of light
   同义词：light meter, exposure meter

pho.tom.e.ter

n.（名词）
An instrument for measuring a property of light, especially luminous intensity or flux.
光度计：用来测量光的性质、尤其是光的强度和通量的仪器