The Special Simulation Model Slide Ruler Vernier Calliper Key Chain Keyring 3d appears to be a keychain that resembles a miniature version of a Vernier calliper, a tool used for precise measurements in engineering and science. It is made of alloy and feather and comes in silver color
This keychain serves as a fun and unique accessory, simulating a vernier caliper and slide ruler, making it ideal for engineers, students, and enthusiasts.