Mountlaser Crack Monitoring Record, 10pcs Tell Tale Monitor for The Standard, Corner Monitor, Measure and Record Instrument

【High Precision Crack Monitoring Scale】Clear printed dual-axis graduated scale with crosshair reticle, accurately measures horizontal & vertical wall crack expansion, contraction and displacement changes. Scale range: -25mm to +25mm, fine grid markings enable you to record tiny structural variations easily for long-term building condition tracking. 【Thickened Premium Transparent Acrylic Construction】Made of sturdy thick acrylic sheet, wear-resistant, shatterproof and fully transparent. No deformation under normal indoor/outdoor ambient temperature, durable for years of fixed wall installation, clear scale will not fade or wear off with long-term use. 【Complete Installation Accessories Included for Easy Mounting】Comes with pre-set fixing pegs, reserved elongated mounting slots on both ends allow flexible adjustment during installation. Simply secure the monitor onto cracked walls, brickwork, concrete or plaster surfaces; no complicated tools required for DIY fitting. 【Widely Used for Structural Building Inspection】Ideal tool for home owners, surveyors, builders, architects and property inspectors. Perfect for monitoring cracks on interior/exterior walls, concrete floors, masonry, plaster, brick buildings, extensions & renovated houses to check subsidence or structural movement. 【Visual Permanent Crack Change Recorder】The red precision cross line serves as a fixed reference datum. You can regularly read scale data to document crack widening/shrinking conditions, great for keeping structural records for property sales, insurance claims and building maintenance assessments.