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The new BUILDERA CRACKMON 4020A is a heavy-duty, patent-pending, building-foundation crack monitor to measure displacement in foundations, concrete, stucco, masonry, plaster, wood, and steel structures. Ideal for restoration, seismic retrofitting, or forensic analysis of differential settlement, the CRACKMON 4020A is an indispensable tool for structural, civil and geotechnical engineers, building contractors, trades professionals, commercial property owners, building inspectors, or homeowners. BUILDERA precision manufactures each CRACKMON 4020A in the USA using premium-quality materials and workmanship for superior engineering accuracy and traceability. Features and Benefits —Extreme durability—50% thicker proprietary polymer compared to classic model (4.5 mm vs 3 mm). —New 2D-plus polar magnitude and X-Y displacement measurement grid with precision TickPoints improve measurement accuracy. —Vibrant rich-black and red UV-cured printing on opaque white background doubles the contrast, enhancing legibility in a wide range of lighting conditions. —Unique serial IDs provide unprecedented engineering traceability in a crack monitor—essential in forensic studies and documentation of client reports. —Integrated GeoQR technology simplifies access to online instructions and easy re-ordering using a smartphone. —Flexible mounting arrangement optimized for #8(M4) or #6(M3.5) tamper-resistant fasteners and epoxy (available separately). —Available tamper-resistant Torx Plus stainless-steel screws and anchors made in USA. —Optional impact-absorbing thermoplastic drilling guide aligns hole centers while hammer-drilling concrete. If it doesn't say BUILDERA CRACKMON, it's not original.