opacimeter
n. 暗度计；烟度计；光密度计；不透明度仪
例句
The application of thermostatic control module based on PID in opacimeter was introduced.
介绍了基于PID算法的恒温控制模块在不透光烟度计中的应用。
Opacimeter: Instru we are pirates, these data are stolen from youdao for measuring the opacity of paper and expressed it as a percentage.
不透明度测试仪：量度纸张不透明度并以百分率表示的仪器。
