A gauge block is a precision tool used in metrology to provide a standard of measurement. Made from high-quality materials like steel or ceramic, these blocks come in various sizes and are used to calibrate measuring instruments. They are often stacked together to create specific lengths, ensuring accuracy in measurements. Gauge blocks are essential in industries such as manufacturing and engineering, where precise measurements are crucial. They are often used alongside tools like calipers and micrometers to verify dimensions. The use of gauge blocks helps maintain quality control and ensures that products meet specified tolerances.