Height measuring device

The utility model relates to a height measuring device, plug in the measuring stick of establishing in surveying buret with the slip including surveying buret, survey buret goes up screw -thread fit has the tightening bolt who is used for with the measuring stick butt, the measuring stick is arranged in the one end tip of surveying buret and is provided with the piston, the piston is laminated with surveying the buret inner wall, is close to be provided with the venthole on the lateral wall of survey buret bottom end, the threaded connection of venthole department has the pressure boost stopper, the pressure boost is provided with disappointing hole beyond the great wall, and its speed is slower when the measuring stick falls, and the measuring stick is difficult for impairedly with surveyburet in use. 本实用新型涉及种高度测量装置，包括测量管与滑动插设在测量管中的测量杆，所述测量管上螺纹配合有用于与测量杆抵接的松紧螺栓，所述测量杆位于测量管中的端端部设置有活塞，所述活塞与测量管内壁贴合，靠近所述测量管底部端的侧壁上设置有出气孔，所述出气孔处螺纹连接有增压塞，所述增压塞上设置有泄气孔，当测量杆下落时其速度较慢，测量杆与测量管在使用中不易受损。