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Material High-quality stainless steel or nickel-plated carbon steel for corrosion resistance Measurement Range Up to 2 inches (50 mm) Tips Tapered, rounded tips for precise placement on soft wax without damage Spring Mechanism Self-opening spring provides consistent tension for accurate measurement Caliper Type Outside caliper – measures external dimensions (e.g., wax pattern thickness) Scale Some versions include engraved scales or may be paired with a digital readout (manual models are standard)