Features: Ensures precisions in your structural assessments with our crack monitors set, essential tool for detecting and tracking wall deformations and cracks with high accuracy. Crafted from acrylic, this crack gauge set boasts durability and a clear scale for easy reading, making it ndispensable addition to your toolkit. For architects, contractors, and diyer enthusiasts, this crack monitoring provide the reliability needed for thorough inspections and maintenance tasks. Whether you're overseeing home renovations, constructions projects, or floor installations, these precise gaps rulers are designing to address a wide ranges of crack measurement needs. You can simultaneously monitors multiple areas, ensuring comprehensive coverage in safeguarding the integrity of your structures. Specifications: Component:Acrylic Ruler: Approx.100x25mm/3.93x0.98inch Yellow Expansion Nail Length:Approx. 30mm/1.18inch Screw Length:Approx. 27mm/1.06inch Package Includes: 1 Set Wall Crack Measuring Tool note: ①.Please allow 1-2cm errors due to manual measurement, make sure that you donot mind befores you order. ②.Due to the differences between different monitors, the picture may not reflect the actual coloring of the item. Thanks for your understandings.