The color contrast scale design enables fast visual comparison of surfaces flaws, while the compact 4 gauge set provides versatile measurement solution across multiple industrial applications 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 Double Sided Laminated Stain & cracks Comparison Gauges precise defect detection with four strong, waterproof surfaces inspection tools for professional component evaluations Crafted from, warp resistant, these cracks measurement tools feature double sided protective film coating to secure long lasting accuracy in demanding work environments, Manufacturer: GAOINTELL