| 摘要 |
<p>The present invention relates to a supporting tool for a staff. The staff is configured to be lifted by through a lifting body by a rack gear portion and a pinion gear portion when the staff is stably fixed, thereby facilitating height adjustment of the staff. The position angle thereof can be easily changed so that it is possible to measure an accurate level by avoiding obstacles around a measurement position. An accurate mark can be formed in a structure of reinforcing bars by comprising further a marker body, easily changing the angle of the marker body, and adjusting the height of the marker body.</p> |
