FOR PROFESSIONALS AND DIY ENTHUSIASTS: Whether you're a professional mechanic or an enthusiast, this calibration rod is perfect for those who need accurate measurements in their projects EASY TO USE: Simply attach this calibration rod to the caliper and adjust the reading value until it matches the mark on the rod. Easy to use and reduces stress Precise Calibration: This external micrometer calibration rod is an essential tool for improving caliper measurement accuracy This calibration rod is made of metal that is durable and long lasting to meet your measuring needs VERSATILE USAGE: Use these calibration rods and jaws to measure a wide range of objects from small to large pieces, Manufacturer: NUEAYMS