Because our Monitorings Gauges can Monitors cracks in wall and how they measure, it is very practical and for you You can use our Corner Monitors to Monitors the horizontal or vertical movement of cracks on a plane It is a precisions instrument The bottom plate of our Measurement Tool is calibrated in millimeters It also have a clear top plate, which is marking with a thin cursors in the shaped Monitors is with a highly clear ABS sheet and easy-to-read measurement grids, so it is clear and It is very practical Gauges Monitors is crafted from ABS, so it is wear resistant, smooth, wear-resistant, and not easy to break, Manufacturer: LIzogli