4pcs Portable Spring Dynamometer Professional High Accuracy Bar Spring Scale for Student Physics Experiment Teaching 4pcs Spring Dynamometer Professional High Accuracy Bar Portable Spring Scale for Student Physics Experiment Teaching Demonstration _x000D_ Feature: _x000D_ _x000D_ 1. PREMIUM MATERIAL: Spring dynamometer is made of premium plastic and iron materials, fatigue resistance spring ensures accurate measurement._x000D_ 2. APPLICABLE: Spring dynamometer can be used for demonstration of physics and mechanics teaching for middle school students and common instrument for student experiment._x000D_ 3. ADJUSTABLE DESIGN: Spring dynamometer has adjustable pointer and scale plate for easy reading of force._x000D_ 4. SUPERIOR PERFORMANCE: The spring dynamometer is manufactured to exacting standards with clear and precise scales._x000D_ 5. EASY TO OPERATE: The portable spring dynamometer is easy to use and suitable for hands on operation by students._x000D_ _x000D_ _x000D_ Specification: _x000D_ _x000D_ Item Type:SpringDynamometer Material: Plastic, Iron Usage: Commonly Used in Physics and Mechanics Teaching Demonstration and Student Experiments for Secondary School Students. Scope of Application: Primary and Secondary School Mechanics Experiments _x000D_ _x000D_ _x000D_ Package List: _x000D_ _x000D_ 4 x_x000D_ SpringDynamometer_x000D_ _x000D_ _x000D_ _x000D_ _x000D_ _x000D_