Features: Sturdy and portable, this small Vernier Caliper Keychain combines sturdy alloy construction, offering pocket size convenience for measurements. Featuring sliding mechanism and corrosions resistant alloy frame, this pocket measuring tool delivers accuracy up to 50mm with crystals clear engraved markings. Designed for jewelry artistics, electronics hobbyists, and field engineers needing instants dimensional checks of small components like beads or microchips during mobile projects. Addition for automotive maintenance, craft workshops, and home tasks requiring measurements of delicate items such as watch parts or circuit board styles. This multifunctional keychain accessory merges industrial durability with everyday practicality, weighing for effortless carrying while maintaining workshop levels measurement capabilities. Specifications: Materials: Alloy Color: As Picture Show, Two Color to Choose Size: 10.5x3cm/4.13x1.18inch Package Includes: 1pc Caliper Keychain note: 1.Please allow 1-2cm errors due to manual measurement, making sure that you will not mind before order. 2.Due to the differences between different monitors, the picture may not reflect the actual color.