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 a enthusiasts, this calibration rod is perfect for anyone who need precise measurements for their projects. Produced of quality metal, this calibration rod is sturdy- and long-lasting, providing support for your measuring need Accurate Calibration: This external micrometer calibration rod is an essential tool to ensure 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., Manufacturer: PURPLELILY