Package Includes: 1 EKG caliper and 1 transparent ECG ruler, suitable for electrocardiogram measurement, 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 for 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, providing an accurate measurement reference Portable to Use: The EKG caliper can be adjusted to the desired length to meet various needs. Its compact design allows for easy storage and portability Wide Application: Ideal for nurses, students, and doctors, this measuring tool helps obtain accurate ECG readings and is a practical gift for medical professionals The EKG caliper includes a plastic clip for easy attachment to nursing uniforms. Its small size fits conveniently in pockets or pencil cases, allowing for easy carry and use 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 inches) 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