Item Type: Standard Tell Tale Crack Monitor Material: Acrylic Board Weight: Approx. 28.00g / 0.99oz Usage: Monitor and Measure Wall Deformation or Cracks Product Size: Approx. 10x2.8cm / 3.9x1.1in Package List 1 x Standard Tell Tale Crack Monitor (2 Parts) 4 x Expansion Tube 4 x Screw 1 x Measurement Record Paper 1Standard Tell Tale Crack Monitor: Crack monitoring scale is used to monitoring the cracks in the walls and how they evolved along the measured time. 2User Friendly: Convenient operation, easy to read measurement grid, eliminating the need for tedious steps, ensuring efficiency and convenience during the measuring process. 3Acrylic Board: Standard tell tale crack monitor is made of acrylic material, durable and sturdy, resistant to deformation, ensuring long lasting usage. 4Lightweight and Portable: Compact and lightweight design, tell tale corner crack monitor is easy to carry and store, enabling use anytime and anywhere. 5Wide Application: Suitable for construction, decoration, and maintenance, monitoring wall deformation and cracks, providing timely assessment and preventive measures.