Ping horizontal mirror device and a method for rapid payoff

The present invention relates to a method of building construction Actinomyces measurement, in particular a Ping mirror means and its combination with laser marking method for fast playback horizontal line. Ping is a mirror device can be a rotation direction, perpendicular to the plane of the mirror plane of the mirror, the method is: respectively and erection laser marking Ping mirror means located in the middle laser marking known elevation room mirror Aeka means located at the intersection of the room door; laser marking instrument is projected out of the horizontal light rays hit the mirror wall and Ping mirror device, the mirror moving means to Ping two rooms at a crossing angle, the projection in the mirror the level of light on the mirror the + mark level coincident; rotatable mirror, the transmission level of light to another room, the use of fountain by the light level transmitted pop horizontal level line, i.e., this horizontal line and the laser marking instrument projected out of the horizontal line consistent. The present invention can reduce measurement errors, rapid payout.