Features: Ensure accurate heart rate measurements with our heart rate ruler, designs to assist medicals professional in analyzing heart health. Crafted from PVC materials, this transparent ruler features clear, wear resistant marking for long terms use and easy portability. Great for doctors, nurses, and medicals students who require precise heart rate analysis tool. Perfect for use in hospitals, clinics, and educational occasion where heart rate examinations and research is conducted. Enhances your diagnostic capabilities with this essential heart rate measurement tool, a must having for any medicals professional. Specifications: Materials: PVC Color: As The Picture Shows Package Weight: approx.25g Size: approx.242x50mm/9.52x1.96in Package Includes: 1Pc Ruler note: Please allow 1-3mm error due to manual measurement. Please make surer you not mind before your bid. Due to the differences between different monitors, the picture may not reflect the actual color to the item. Thanks!