Features: The crack width ruler can accurately measure the size of cracks in the walls, helping users detect problems in a timely manner. Made of acrylic material, lightweight and easy to carry, with simple operation suitable for various usage scenarios. In addition to monitoring cracks in building walls, it can also be used for measuring other gaps. Features -Color:As Shown-Material:Acrylic-Size:14.50X3.00X1.00cm/5.70X1.18X0.39in-The crack measurement tool provides accurate and precise measurements of cracks.-Lightweight and portable, makes the crack width ruler easy to carry and use in various locations.-The versatile application of the crack measuring ruler allows for measuring gaps of different sizes and shapes.-The visual comparison feature with the corner crack caliper helps in identifying and monitoring cracks in acrylic corners, bring you good using feeling.-Practical crack monitoring tool saves time, is efficient in detecting and tracking cracks in building walls.Packing list: 1 x gaps crack ruler