Adjustable Aluminum Ring Ruler for Practice and Demonstration A lightweight, durable measuring tool designed for educational, technical, and nonclinical demonstration settings where accurate file or smalltool measurement is required. Key benefits Precise, repeatable measurements: Clear, easytoread scale from 0 to 30 mm supports consistent measurement and documentation during training and demonstrations. Comfortable, secure fit: Flexible ring design resizes quickly to match different hand sizes for a snug, stable fit during demonstrations or mock procedures. Portable and durable: Aluminum construction balances strength and low weight for regular use without adding bulk to a training kit. Simple to use: Quick resizing and visible markings make the tool practical for instructors and learners, reducing setup time and measurement errors. Features and specifications Measurement range: 0 to 30 mm with clearly marked graduations for consistent readings. Material: Aluminum for a sturdy yet lightweight feel. Design: Flexible, adjustable ring that fits a range of hand sizes and stays in place during demonstrations. Function: Intended for practice, demonstration, and nonclinical measurement tasks involving files and small tools. Typical applications Technical training classes and classroom demonstrations where instructors need a reliable, wearable measuring aid. Workshop and laboratory use for measuring small tools and components during teaching exercises. Mock procedures and technique practice in nonclinical training environments to help learners develop measurement consistency. Practical, easy to adjust, and built for repeated use, this ring ruler provides a dependable measurement option for educators and technicians working in training and demonstration settings.