ruler is a versatile tool that offers high precision measurement for detecting cracks in building walls. Using acrylic material, light in weight and portable, allowing users to easily carry it around and use different settings. Not only can it be used for crack monitoring in building walls, but also be utilized for measuring gaps in various other applications. Features -Color:Multi -Material:Acrylic -Size: 10.00X3.00X1.00cm/3.93X1.18X0.39in - measurement ruler provides high precision for detecting cracks, of highly practical. -Using acrylic material, ruler is not easy to deform or break, withstand long time using. - scale ruler is suitable for different usage scenarios, portable to take and convenient to store. -The comparison crack ruler allows for visual assessment of crack severity, let you own satisfying using feeling. -Practical crack width ruler has clear scale, can be used rest assured, safe to your hands, good for architecture use. Package list: 1 x gaps crack ruler