它叫测面器，它能够测量面积。

This is called a planimeter. And what it does is it measures areas.

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所以人们发明的这个东西被称作测面器。

So, people invented these things called planimeters.

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介绍了一种以半导体激光器为光源，以新型CMOS面阵图象转换器件为传感器的智能型覆铜板测厚系统。

An intelligent coated plate thickness measurement system based on a semiconductor laser diode as light source and a CMOS image sensor is introduced.

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