Portable Geological Tool: Compact and versatile, this pocket-sized tool is a must-have for paleontologists in the field and lab. From dinosaur hunting to forensic cataloging, it's designed for precise measurements and accurate notes on-the-go. Durable Stainless Steel Construction: Crafted from 0.5mm thick laser-etched stainless steel with a black enamel coating, this tool ensures a lifetime of use. Its smooth edges prevent accidental cuts, making it as sturdy as a heavy metal credit card for all your excavation needs. Comprehensive Geological Reference: Laser-engraved with the GSA "Era of Life" table, this tool provides a complete geological timeline from billions of years to eras and periods. Ideal for students and enthusiasts alike, it's like carrying a portable history book in your pocket. Sketch and Measure with Precision: Featuring built-in ruler, compass, and protractor, this tool helps you sketch and measure specimens accurately. Capture the intricate details of fossils or rock formations with ease, ensuring your notes are detailed and symmetrical. Practical Field Companion: Whether you're knee-deep in soil or meticulously cataloging bone fragments, this tool is your reliable companion. Designed by professional paleontologists, it's a unique gift for hunters and rock lovers. Item Name: Scale Ruler Material: Metal Office Tools: Unit Conversion Tool Features: Portable, Small, Compact Size Details: A, L: 9.3cm/3.66", W: 6.3cm/2.48" (Approx.) B, L: 8.5cm/3.35", W: 5.7cm/2.24" (Approx.) C, L: 8.5cm/3.35", W: 5.7cm/2.24" (Approx.) D, L: 8.5cm/3.35", W: 5.7cm/2.24" (Approx.) Notes: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: 1 x Scale Ruler