Features: The Crack Gauges Set is a strong and reliable measurement tool for monitoring cracks. Produced of acrylic 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 space and monitoring crack development. This crack gauge monitor can be used in various situations such as home improvement projects and interior decoration. Whether 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. 12.3 cm x 3 cm (4.84 in x 1.18 in) Package Includes: 1 x Crack Gauge Note: Please allow 1 mm error due to manual measurement. Due to differences between monitors, the picture may not reflect the actual color of the item.