Practical: with the crack monitor, cracks in walls and their development can be monitored over the measurement time. EASY INSTALLATION 2 panels can be easily joined together without the need for glue or complicated installation steps. It is convenient and stable to use. Accurate The crack monitor with highly transparent acrylic plate allows easy reading and viewing of the data. The scale plate is equipped with scales in horizontal and vertical directions. The indicator plate has a design with crossed indicator lines. Crack Monitor: The crack monitor consists of 2 panels with overlapping part lengths. The bottom plate is calibrated to the millimetre, the top plate is clear and marked with a crosshair cursor. Convenient and convenient to use. HIGH QUALITY ACRYLIC This crack monitor is made of high quality acrylic, sturdy and durable. And is water, scratch and sun resistant. Easy to install and reusable., Weight: 0.23368999772 Pounds, Manufacturer: Lobamop