Crafted from , resistant , these cracks measurement tools feature double sided protective film coating to secure long lasting accuracy in demanding work environments. Ideal for process inspectors, construction professional, and industrial maintenance teams requiring stable surfaces imperfection assessment instruments. Perfect for on site concrete inspection, manufacturing checks, and infrastructure maintenance projects where portable defect identification tools are essential. The color contrast enables fast visual comparison of surfaces flaws, while the compact 4 gauge set provides versatile measurement across multiple industrial applications. 4pcs Multipurpose Defect Measurement Cards Not Deformable Design with Contrast Scale for Fieldwork Inspection