Features: OOTDTY The Crack Gauge Set is a durable and reliable measurement tool for monitoring cracks. Made of acrylicy material, this crack gauge monitor is wear resistant and not easily breakable. Suitable for DIY enthusiasts and professionals, this precise Measuring Tool is perfect for measuring gaps and monitoring crack development. This crack gauge monitor can be used in various scenarios such as home improvement projects and interior decoration. Whether you are a professional or a homeowner, this Monitoring Device is a must have tool for detecting wall deformations and cracks. Specifications: Material:Acrylic Quantity:2,4 Size:Approx.12.3cm/4.84''x3cm/1.18'' Package Includes: 1x Crack Gauge Note: Please allow 1mm errors due to manual measurement. Due to the difference between different monitors, the picture may not reflect the actual color of the item.