Features: Accurate scale, simple design allows easy operation. Made of high quality material, durable, anti deformed. Can be used for measuring gemstones jewelry components bead and more. With the use of copper ruler, the caliper will naturally oxidize, forming a retro charm. Measuring range 0-80mm, usually buy cultural and for play objects, carry them with you, easy to measure. Specifications: Material: Brass Size: Approx. 9.5x3cm/3.74x1.18in Measuring Range: 80mm Note: Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Package includes: 1X Copper Ruler