This transparent crack width ruler is specifically designed for monitoring and measuring cracks in various surfaces. Its high- make it easy to determine the width of cracks, which is essential for assessing structural integrity. Place the ruler over and read the measurement through the transparent film, ensuring that you get an accurate reading without any obstruction. Features -Color:Multi -Material:Plastic -Size:10.00X5.70X0.01cm/3.93X2.24X0.00in -Highprecision measurement: the chest card gauge film ruler offers precise measurement capabilities, essential for tasks that require exact dimensions. -Multipurpose defect measurement: this tool can measure point gauges, line gauges, spots, and cracks, making it versatile for various . -Clear scratch comparison: the transparent scratch ruler included provides a clear and accurate comparison of surface scratches, enhancing defect detection. - construction: made from plastic materials, this measurement tool is built to last, ensuring longterm reliability and performance. -Ease of use: designed for ease of use, it is simple to operate and suitable for a wide range of work environments, making it accessible to all users Package list: 1 x Flaw Detection Film Ruler