Special Simulation Model Slide Ruler Vernier Caliper Key Chain Keyring Miniature Precision Measuring Tool Pocket Size Metal Alloy Educational

This miniature slide ruler vernier caliper keychain replicates the look and function of a precision measuring instrument in a compact, portable form. Crafted from durable metal alloy, it features a working sliding jaw and engraved scale markings for demonstration or educational use. Ideal as a novelty gift for engineers, machinists, students, or hobbyists who appreciate precision tools. Attaches easily to keys, bags, or lanyards for everyday carry. Not intended for actual measurement calibration but serves as a detailed simulation model and conversation piece.