This opisometer is the perfect addition to any drafting or engineering toolbox. Its precise measuring capabilities make it a valuable tool for anyone working on detailed designs or plans. Whether you're an engineer, scientist, or collector of vintage drafting tools, this opisometer is sure to impress. With its sleek design and durable construction, this  opisometer is sure to last for years to come. Its accurate measurements and ease of use make it an indispensable tool for any project. Whether you're measuring curves or calculating distances, this opisometer is the perfect tool for the job. Don't miss out on the opportunity to add this unique and valuable tool to your collection.