Features: With its compact and portable design, this mini keychain caliper is perfect for measuring. Made from durable zinc alloy, this caliper is built to last and can withstanddailyuse. For professionals in the fielddof engineering, jewelry making, and more, this caliper provides accurate measurements up to 4cm. Whether you're working in a workshop, at home, or on the field, this handy caliper willhelp you measure with ease. Attach it to your keys, car, bag, or suitcase, and alwayshave a reliable measuring tool at hand. Specifications: Material: Zinc Alloy Size: As Shown Package Includes: 3x Vernier Caliper Straight Tooth Keychain note: Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. Due to the difference between different monitors, the picture may not reflect the actual color of the item.