How do I measure the size of an aluminum coil?

To measure the size of an aluminum coil, you'll need to measure its diameter, width, and thickness. Use a tape measure or a caliper to measure the coil's diameter and width. For the thickness, a micrometer or a coil thickness gauge can be used. Ensure the coil is laid flat and measure at several points to get an average thickness. If the coil is wound, you may need to unroll it partially to take accurate measurements. Always follow the manufacturer's guidelines for your specific measuring tools to ensure accuracy.