Package Includes: You receive an EKG caliper and 1 parent ECG ruler, suitable for electrocardiogram drawing, ideal for use in schools and hospitals Quality Material: The ECG caliper is made of stainless steel, and the ECG ruler is made of plastic, durable and resistant to rust and deformation, ensuring long-term use Ruler Design: The protective cover features a scale with a measurement range of 0-6cm/0-2.4 inches. The EKG ruler measures 24cm/9.4 inches in length, ideal for measurement reference Portable to Use: The EKG caliper can be adjusted to the desired length to meet your needs. Its compact design allows for easy storage and portability Wide Application: This EKG caliper measuring tool is ideal for nurses, students, and doctors, useful for measuring accurate results and data, making it a practical gift The EKG caliper pen includes a plastic clip that easily attaches to nursing uniforms. Its small size fits conveniently into pockets and pencil cases, allowing for easy carrying and use anytime, anywhere Product Name: EKG Calipers and EKG Ruler Combination Set Size: 1.7x11.4cm/0.7x4.5 inches Ruler: Length: 24cm/9.4 inches, Width: 5cm/2.0 inches, Thickness: 0.12cm/0.05 inch Color: As Shown Material: Plastic Package Contents: 1 set x ECG Caliper Measuring Tool Note: Light reflection and different displays may cause slight color variation between the image and the actual item. Measurement error allowance is +/- 1-3cm