Clear and Precise: Crack Monitor is designed with a highly clear acrylic sheet and an easy-to-read measurement grid, so it is clear and precise. It is very practical. Crack Monitoring: Corner Crack Monitor is a simple and cool analog crack monitoring device and a precision instrument used to monitor the horizontal or vertical movement of cracks on a plane. High-Quality Material: Crack Gauge Monitor is made of high-quality acrylic material, so it is durable, sturdy, smooth, wear-resistant, and not easy to break. Clever Design: Crack Measurement Tool consists of two boards that overlap for part of their length. The bottom plate is calibrated in millimeters, and the top plate is transparent and marked with a thin line cursor in the shape of a cross. Great Purpose: To tell the story of 2D manual crack monitoring work. Crack Monitoring Gauge is used to monitor cracks in walls and how they evolve measured.