Features: The high precision SEC size estimation chart is an essential tool for detecting flaws in various materials. Ideal for quality control in manufacturing, this chart helps identify defects in diameter and line width with high accuracy. Simply place the transparency over the material and use the chart to measure and compare any imperfection Features -Color:Multi -Material:Plastic -Size:10.00X6.20X0.01cm/3.93X2.44X0.00in -High precision measurement: the flaw detection gauge ensures accurate measurement of various dimensions, making it ideal for various tasks -Versatile application: this ruler can be used for measuring points, lines, stains, and cracks, catering to diverse measurement needs -Durable and reliable: made from plastic materials, this flaw detection tool is wearresistant and durable, ensuring longterm use -Clear visibility: the transparent design of the line projection instrument allows users to easily observe and record measurement results -Userfriendly: simple to operate, this chart ruler measuring tool can be used effortlessly even without practical knowledge Package list: 1 x ruler