Durable and sturdy: Crack Gauge Instrument Monitor is made of quality acrylic material, providing durability, a smooth surface, wear resistance, and resistance to breaking. Clear and precise: The device features a clear acrylic sheet with an easytoread measurement grid, delivering accurate and practical monitoring results. Analog crack monitoring device: The Corner Crack Monitor is a simple and effective analog tool that can track horizontal or vertical movement of cracks on a plane. Convenient and practical: The Crack Monitoring Gauge set enables monitoring of cracks in walls and how they evolve over time, offering convenient and reliable maintenance support. Use scenario: After drywall installation or plastering, use the gauge to observe crack development over time to determine if repairs are needed. Use scenario: In existing homes, monitor cracks around openings such as windows and doors to assess structural movement and guide maintenance decisions. Use scenario: During renovation or restoration projects, track crack progression on interior walls to inform planning and ensure stability before proceeding.