Simple and easy wall crack monitoring devices

The utility model provides a simple and easy wall crack monitoring devices, include: the both sides at wall crack are arranged respectively to two fixed disks to it is fixed to hug closely the wall, two rotation axises are respectively and are fixed in perpendicularily two fixed disk middle parts all are equipped with the screw thread section on two rotation axises, spiral arm, its both ends the annular ring has and respectively the cover be in on two rotation axises the spiral arm middle part forms Z shape cutting joints, the horizontal centring ware, it is fixed on the spiral arm, two vice fixation nut, respectively with the screw thread section of two rotation axises is connected, can clip the tip of spiral arm and making unable relative rotating axis is rotatory for the spiral arm, makes the spiral arm keeps at horizontal position. The utility model discloses small, light, the installation is simple, not only can realize observation directly perceived and measurement to the three -dimensional deformation