Crack Monitoring Record, 5pcs Corner Tell Tale Monitor, Monitor for The Standard, Measure and Record Instrument

【Precision 2D Crack Monitoring】Features ±20mm horizontal and ±10mm vertical measuring range with clear 0.5mm scale markings, allowing accurate tracking of crack widening and wall displacement over time for structural safety checks. 【Durable & Weatherproof Acrylic Construction】Made of high-quality transparent acrylic, the crack gauge is impact-resistant, UV-stable and suitable for long-term indoor and outdoor use on walls, concrete, foundations and buildings. 【Complete Installation Kit Included】Comes with stainless steel screws for quick and secure mounting across cracks. The double-plate design moves independently to record even subtle structural changes without interference. 【Easy-to-Read & Long-Term Tracking】The clear grid and numbered scale let you easily record initial readings and compare changes later, ideal for homeowners, builders and surveyors to monitor structural cracks before/after renovation or settlement. 【Versatile Application Scenarios】Suitable for monitoring cracks in walls, ceilings, floors, foundations and masonry. Perfect for structural safety inspections, settlement monitoring, renovation works and property condition surveys.