[Purpose] This crack monitoring gauge is designed to monitor cracks in walls and their development over time. The instrument consists of a graduated plate and an indicator plate, a graduated plate (with scales in the horizontal and vertical directions) and an indicator plate (one or two crossed indicator lines). [Precision Instrument] The crack monitoring gauge adopts advanced technology, perfect for tracking the horizontal and vertical movement of cracks on flat surfaces. This precision instrument can ensure reliable detection and monitoring of changes in crack width or length over time. [Premium Acrylic Material] The crack monitoring file is made of high-quality acrylic material, which is sturdy and can be used repeatedly. It is waterproof, sun-resistant, wear-resistant, and scratch-resistant. It is easy to install and intuitive to read. [Widely Used] Crack measuring and recording instrument is widely used to observe crack opening and closing and misalignment on the of various