Check the listing for details. Firm Joint Outside Caliper 600mm 24 Inch Tool Steel Measurement Tool. Condition: New. Listed at 48.48 USD. 1. Constructed from tool steel with heat treatment and a chrome finish, this caliper offers durability, resistance to corrosion, and a smooth, reflective surface.2. Outside calipers are easy to operate and can transfer the inside and outside measurements of models to clay. The sturdy joint calipers use friction at the joint to fix the legs so that they will not move, ensuring stable and accurate measurements.3. Outside calipers can measure the thickness and outside diameter of objects such as sculptures, pottery, clay, pipes, holes, etc. They are suitable for jobs such as carving, shaping and modeling, and are perfect for craftsmen and professionals who need precise internal measurements..4. Notice: Ensure the caliper is clean and dry before and after use to maintain its accuracy and longevity.