1、The product is made of pure copper, which is not easy to rust and has a long service life. 2、Copper is a relatively soft metal. The ruler made of this material is comfortable to hold. 3、The scale is engraved by a precision machine. The figures are very clear and easy to read. 4、The product is compact, portable and suitable for outdoor operation. 5、Whether it's archaeological work or students doing experiments, this product is very suitable. Feature: The product is made of pure copper, which is not easy to rust and has a long service life. Copper is a relatively soft metal. The ruler made of this material is comfortable to hold. The scale is engraved by a precision machine. The figures are very clear and easy to read. The product is compact, portable and suitable for outdoor operation. Whether it's archaeological work or students doing experiments, this product is very suitable. Specification: Material:  Copper Weight: 34g / 1.2oz Measuring range: 0-80mm / 0- 3.1in Read value: 0.1mm Product dimension:  9.7* 3.3* 0.2cm / 3.8* 1.3* 0.1in Package list: 1 * Vernier Caliper Note: The actual product color may deviate from the photo due to light. There may be a slight deviation in the measurement of product.