Description: 【Versatile Monitorings Tool】: This Crack Gauge Monitor is designed for monitorings wall deformations and cracks, making it an essential tool for ensuring structural in various buildings 【Specifications】: The measuring range is -30 to +30mm with a resolution of 1mm and accuracy of ±1mm. The Crack Monitorings Record dimensions are 3.94inchx1.18inch, ensuring reliability in various conditions 【Precision Measurement】: Equipped with a scale plate featuring both horizontal and vertical scale, and an indicator plate with cross indicating lines, this Building Crack Monitor allows for accurate observation of surface crack width changes and displacement between two points 【User Friendly Design】: With easy installation and intuitive reading capabilities, this Crack Monitorings Gauge simplifies the process of tracking structural changes over time 【Material】: The Crack Monitor Record is made of acrylic material, providing everything you need for effective crack observation and measurement Specification: 10cmx3cm/3.94inchx1.18inch Package Includes: 1 Set Crack Monitor Record Note: Please allow slightly errors due to manual measurement and different monitors.