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1·As I mentioned earlier we will be using the ruler Tool. Make sure that rulers and guides is turned on.

正如刚才所说，我们要使用标尺工具。确保标尺和参考线都是打开的。

2·Use: Test the flatness of plate, leveling ruler, machine tool working platform, guides and precision work-piece.

用途：检测平板、平尺、机床工作台、导轨和精密工件的平面度、直线度。