Please repeat the experiment using a wooden ruler, a coin, a pencil and a rubber eraser.
请用一把木尺、一枚硬币、一支铅笔、和一块橡皮，重做这个实验。
The utility model is composed of a level ruler body (1), an elasticity plastic clamp (2), a wooden folding ruler (3) and a level ruler component.
它由水平尺尺体（1）、弹性塑夹（2）、木折尺（3）及水平尺组件所构成。
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