Simple to Use: Simply attach this calibration rod to your caliper and adjust until the readingmatch the marks on the rod It is simple to use and saves you and frustration For Professionals and DIYers: Whether you ' re a professional machinist or a enthusiasts, this calibration rod is perfect for anyone who need precise measurements for their projects Accurate Calibration: This external micrometer calibration rod is an essential tool to the accuracy of your caliper measurements All-rounded Usage: Use this calibration rod with calipers to measure a wide ranges of objects, from small parts to larger component : Produced of metal, this calibration rod is sturdy and long-lasting, providing for your measuring need, Manufacturer: UncleS