Features 1、Excellent Acrylic Acid Material: This crack monitor is made of excellent acrylic acid material with high abrasion resistance, not easy to deform, erosion resistance and long service life. 2、Clear Scale: This crack monitoring record has a clear scale with a black background and red cross, possessing a visual difference and high accuracy of measurement. 3、Good Workmanship: This portable tell tale corner crack monitor has good workmanship, with flat sanding, neat edges, no burrs, and high stability. 4、Compact And Portable: This concrete crack monitor is small in size and light in weight, which makes it very convenient to carry around and use. 5、Wide Application: This tell tale crack monitor has a wide range of applications and can be used at home, construction sites, renovation and so on. Specification Item Type: Crack Monitoring Record Material: Acrylic Acid Package List 1 x Crack Monitoring Record 2 x Fixing Screws 4 x Screws 4 x Expansion Screws 1 x Monitoring Record Book