Features: There are 5 standard, 200/250/300/400/500mm, pick your own. With a carbide needle, which can easily for cross the workpiece. Made of stainless steel material, wear resistant, anti-impact and durable. La-ser engraving scales, anti-abrasion, clear and accurate. Accurately measure and score workpieces. Measure the outer diameter of various objects. Specifications: Material: Stainless Steel+Harden Alloy Range: 200/250/300/400/500mm(optional) Style: 0.1mm/0.05mm(optional) System: Metric Note: Please allow 1-3cm error due to manual measurement. pls make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Package includes: 1x Parallel Crossed Caliper