Check the listing for details. 2pcs Standard Measuring Rod 75mm Caliper Micrometer Calibration Block Rod. Condition: New. Listed at 14.45 USD. DescriptionSize - 75mm outside micrometer standard measuring block with high precision of ±0.001mm, universal caliper outside diameter calibration rodMaterial - Made of high-carbon steel, ensure durability and accuracy, making it a reliable tool that can provide accurate readings over time.Feature - The micrometer standard calibration rod has a known length that is used to check the accuracy of the micrometer before measuring an object's thickness or length.Application - Available in various sizes, these micrometer standard calibration rods are commonly used in manufacturing, research, and quality control settings where precise measurements are necessary.Usage:Insert the rod between the micrometer jaws and compare the reading to the known length with a tolerance of a few microns.