acrylicy material, this crack gauge monitor is wear resistant and not easily breakable. Whether you are a professional a homeowner, this Device is a must have tool for detecting wall deformations and cracks. This crack gauge monitor can be used in various scenarios such as home improvement projects and interior decoration. Suitable for enthusiasts and professionals, this precise Measuring Tool is perfect for measuring gaps and crack development. The Crack Gauge Set is a and measurement tool for cracks., Manufacturer: YOULIXIAOWU