Accurate Measurement: The crack gauge is perfect for professional use. You can accurately measure cracks in the range of 0.1 mm to 2 mm. It can accurately monitor cracks, adjustments, and thicknesses. The ruler provides you with excellent measurement accuracy. Package Contents: Includes 2 pieces of rulers with high-resolution silk printing. Each ruler has 3 different measurement scales, covering various applications. Transparent: Place the crack gauge over the object or crack to be measured. Thanks to the transparency of the ruler, you can perfectly observe the width of the crack and accurately mark the locations. Designed for Portability and Ease of Use: is specifically designed to meet your lifestyle and needs. With a thickness of 0.5 mm, it is very sturdy and its stability is similar to a credit card, so you can take it with you anywhere. Anyone can use it easily regardless of experience. Versatile: Whether you are a construction worker, art conservator, or DIY enthusiast, meets your needs. The crack gauge is a versatile and reliable addition to your toolbox, giving you the precision you need to perform tasks safely. Note: All data is measured manually, please allow 1-3 cm error due to differences in light and display, color differences may occur, please refer to the actual product received. The after-sales warranty is a continuation of our commitment to quality. No matter how small the problem, we will do our best to ensure you feel our utmost care and attention.