Accurate measurement: This crack measuring ruler is ideal for professional work. You can accurately measure cracks from 0.1 mm to 2 mm. It accurately tracks cracks, alignments, and thickness. This ruler provides you with superior measurement accuracy. Package contents: Includes two high-resolution screen-printed rulers. Each ruler is equipped with 3 different measuring scales to meet various application needs. Transparent design: Simply place the crack measuring ruler on the object to be measured or the crack. Since the ruler is transparent, you can perfectly measure the width of the crack and accurately mark its location. Portable and easy to use: Designed to meet your lifestyle and needs. With a thickness of only 0.5 mm, it is extremely robust and durable, with a stability comparable to a credit card, making it easy to carry. Anyone can easily use it, regardless of experience. Versatile use: Whether you are a construction worker, art restorer, or DIY enthusiast, it can meet your needs. The crack measuring instrument is a versatile and reliable tool that helps you measure accurately, safely, and efficiently to perform various tasks. Note: All data is measured manually. Please allow an error of 1–3 cm due to differences in light and screen. Colors may vary; please refer to the actual product.