Features: The Crack Gauges Set is a strong and reliable measurement tool for monitoring cracks. Produced of acrylicy material, this crack Gauges monitor is wear resistant and not easily breakable. Suitable for DIY enthusiasts and Professional, this precise Measuring Tool is perfect for measuring space and monitoring crack development. This crack Gauges monitor can be used in various situation such as home improvement projects and interior decoration. Whether a professional or a homeowner, this Monitoring Device is a must get tool for detecting wall deformations and cracks. Specifications: Material:Acrylic Quantity:2,4 Size:Approx.12.3cm/4.84''x3cm/1.18'' Package Includes: 1xCrack Gauges note: Please allow 1mm errors due to manual measurement. Due to the differences between different monitors, the picture may not reflect the actual colorful of the item.